archive-edu.com » EDU » I » IRIS.EDU

Total: 1070

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • IRIS Internship Program - Sara Kowalke
    phases in the data or start my AGU abstract Since I have been stressing a little about the abstract I am going to work on that first Even though we don t have any results yet I can work on introducing the back projection technique and some of our methods and hopefully next week we can splice the results into it before submission In other news I am now 21 years old Which doesn t mean too much for me since I don t drink at all but I still had a super fun birthday Although I had to work all day I still went out to dinner at a yummy italian restaurant and all my friends from home called to wish me a happy birthday My sister sent me a box full of balloons and decorations and now it looks like my room is being taken over by the balloons I am going to Providence this weekend with my friend from MN and that will be a good time I am definitely looking forward to it That s about all I have to report I have been increasing my hours at the lab to finish in time Hopefully I can still pull this off Link to Post Comment on this Post 1 Comments Gah July 22nd 2011 Ok so I am kind of getting sick of this whole 2 steps forward 1 step back thing I know I switched them but 2 and 1 is more relevant to my experience In order to combine my arrays with the TA data aligned with an aftershock I needed to sync the time location depth and magnitude information for both arrays No problem there I also had to filter both of them so all my data had the same sampling rate So I went through and did that but ended up having to decrease my sampling rate to 0 2 from 0 05 for the TA data and 0 02 for the HINET data Then I went through and realigned all the HINET data which takes about an hour each because there is so much data based on this new sampling rate only to be told at today s group meeting that the HINET originally had a sampling rate of 0 01 instead of 0 02 meaning I originally filtered it with a decimation factor of 2 instead of 1 which was week 1 when I didn t know what a decimation factor really was and was only following Eric s instructions then ended up re filtering it yesterday which isn t good So now I am going back to re filter all the original HINET data so I will have a sampling rate of 0 1 but that means I also have to re filter all the TA data again too AND I have to redo ALL of my alignments for the bazillionth time Gah So yeah needless to say I will be putting in extra hours to do that On the semi bright side Eric is going to go in and do the deep phase alignments so they are ready to go whenever I get done with the P and PcP alignments Although it is very nice and efficient of him to do this I still feel bad that he has to do what would have been my work and put his own on the back burner because these earthquakes are so complicated and everything keeps going wrong Also on the bright side I got some tips from Miaki on how to write an abstract when you don t have any results yet I better get cracking on that this weekend so I can ask Miaki and Eric for feedback before the deadline My fingers are still crossed that this is the last thing that goes wrong but this summer has obeyed Murphy s Law to a T so I won t hold my breath It s my birthday on Monday and although I will have to work all day this weekend I have carved out some time to celebrate with friends I just hope the heat doesn t deter any of our plans This past week or so I have been way jealous of Caroline B since she is currently experiencing Australian winter I could definitely use some relief as I am sure all of the other interns could too If I had a couple thousand dollars laying around I would totally fly to the southern hemisphere For now though I will just stick to the AC on full blast Link to Post Comment on this Post 1 Comments Webinar Communicating your research to non science audiences July 19th 2011 A couple weeks ago we had a webinar that addressed methods of describing your research in ways that are geared toward more general audiences who are not familiar with the jargon or common techniques of your field After the webinar we were assigned a task to create a 500 word description of our summer research project that is appropriate for a 15 18 year old audience The following paragraph is the desciption I wrote My research revolves around deep earthquakes Deep earthquakes are important to research because they reveal pieces of information about the composition movement and development of our Earth For my project I am analyzing one sequence of three major earthquakes and their aftershocks There are three main shocks with magnitudes of 7 3 7 6 and 7 4 that occurred in the same area in the Moro Gulf of the Philippines at depths of 585 640 km In order to analyze these three earthquakes I use computer scripts which are a set of commands and variables for the computer to run that changes the data into a file I can use to visualize the waveforms The image that I see has a lot of horizontal wavy lines that show me information about the earthquake Small waves mean small parts of the earthquake and the large peaks are the strong parts of the earthquake Typically deep earthquakes show a flat part then a sudden series of large peaks before it dies down to smaller peaks The sudden large peaks mean the earthquake is impulsive If the size of the peaks grows more gradually that is flat then small peaks then large peaks then small peaks again the earthquake is emergent This set of three earthquakes is emergent even though deep earthquakes are usually impulsive This means that these earthquakes are very unique and definitely worth learning about because they could reveal new information about the deep Earth Once I have this image I change some of the variables in the computer scripts to make the first wave shift slightly and line up I align the first waves of the waveforms because the amount of shift necessary to line them up is important in the next step Once the first waves are aligned for all of the lines I run more scripts that change the data into maps that show me the coastline epicenter which is the point where the earthquake began and a burst of color that shows the ground motion caused by the earthquake For each of these maps I can also create an animation that shows the color from the ground motion move across the screen and show me where the earthquakes are on the map and how they moved during the time period of the earthquake The animations are called back projections and they are used to visualize earthquakes Once I finish the back projections for the three main events I will incorporate the aftershock data into the computer scripts and combine all of the animations into one that will show me all of the earthquakes from the Moro Gulf sequence Hopefully when this is finished I will identify something about deep earthquakes that is not yet known Link to Post Comment on this Post 1 Comments Slowly but Surely July 18th 2011 Good news on the back projection front The technique of using the aftershock to align the main events increased our resolution to an encouraging threshold last week I aligned each of the main events from the TA array with the aftershock and there is more usable information so that feels good Next I have to incorporate the HINET array by combining the TA and HINET data into what will hopefully be the winning combination and show us what we re looking for Although things have not exactly been ideal on the research front I am optimistic about where things are headed I just hope they get crackin because I would like to liven my abstract up a bit before the deadline on Aug 4h which is not only coming up way too fast but is also a week before my research is supposed to be over So yeah I will be keeping my fingers crossed until we reveal some more interesting insights into deep earthquakes I took my GRE on Friday and did relatively well I did about as well as I expected but a part of me hoped I would rock the socks off that test so I didn t have to worry about it again I am right on the cusp of deciding wether to take it again or not I am going to talk to the people who I am interested in working with a bit before I decide to see if they think taking it again would increase my chances of getting into their program Hopefully they agree and think it is good enough because I really don t want to take it again Next monday is my 21st birthday and my friend Amanda and I are going to spend the day in Providence to celebrate on the 23rd I am so excited to see her She is working at Yale this summer and it s always fun to hear what she s up to I am not even sure what we are going to do in Providence but I m sure we ll find something I finally managed to take a dip in the Atlantic last weekend I think I prefer the Pacific but I don t have any concrete reasoning behind it I also finally got my tickets to Fenway for a game in a couple weeks and I am so excited to see the park After my GRE I had my first experience on the Boston subway and learned that everyone who told me it was really easy to get around Boston on their mass transit was correct You can go just about everywhere I love things that are convenient That s about all of the updates I have this week I will keep you posted on my progress Link to Post Comment on this Post 1 Comments Chuggin along July 13th 2011 Hey all I spent the last week working with a smaller event a M5 7 aftershock from the TA array in attempt to align the three larger earthquakes with this one and resolve all of the array and network issues I have been having for the past month or so I just finished back projecting the aftershock mainshock alignments and they still smear in the same direction as the HINET array which as I recall was the original issue I have yet to discuss this with Eric as I will do this afternoon but I am really hoping this miraculously works because not only am I behind schedule but also incredibly sick of doing the same thing over and over and over I could use a little something to spice up my life a bit The positive thing is that the new back projections are better than the original TA animations but I am not quite sure if they are usable yet I am having lunch with Miaki and the group tomorrow and it would be great to have something positive to report rather than the same old thing Fingers crossed Below is my latest screen shot at least I work with pretty colors to keep myself from going nuts This is the only reason a 27 screen is useful to open a whole bunch of windows and be able to see all of them I don t really have much else to report I am taking the GRE on Friday so studying for that has been monopolizing my free time I convinced myself that once it was over I could relax but reality has set in and I realize that I have registration grad school contacts and a lot of other logistic responsibilities before I can take it easy I guess I should be used to that by now but I just have to take it one step at a time Since I am keeping so busy this summer is flying by I can t believe it is the middle of July already and that I will be back at school in 6 weeks Honestly it will be good for my life to regulate itself again I have been bouncing around all over the place this summer which has been sweet but it is always nice to go back to San Diego and have things calm down a bit I will hopefully have good news and new things to post about next time Until then Link to Post Comment on this Post 6 Comments Back at the Beginning July 6th 2011 So I didn t get much of a chance to work wit the European data to see if it will solve the issues we ve been having but now I am going back my old friend the TA array Although the back projections turned out weird and smeared in the same direction as the HINET which is our sort of base array that has stayed the same throughout this process we are taking a new approach with the P alignments to try and remedy the smearing issue To accomplish this we are aligning a smaller deep aftershock associated with the original 3 events aligning it which is easier due to its more impulsive waveforms then using it as a base to align the three larger magnitude earthquakes We hope that this will give us a better alignment and solve our back projection issue If not I don t know what we are going to try It s interesting because Eric and Miaki expected the alignments to be no problem However due to the uniqueness of these earthquakes the fact that they are pretty emergent for deep earthquakes is causing some issues with the way they usually perform the back projection technique Once we finally get data we can use Eric assures me we will make great leaps as the rest of the internship progresses and by the time the AGU abstract submission deadline approaches The first few weeks I spent here I didn t have much to do and I was kind of moping around due to boredom but I realized today that I have plans every weekend until school starts back up again Who knew I actually had a life I sure didn t The Boston Pop s Fireworks Spectacular was a lot of fun I walked about 2 miles down to MIT and found a perfect spot for viewing I was advised to go early and make a day of it so I got there around 5 30 fireworks were scheduled for 10 30 and I was sort of surprised there wasn t more to do People were just sitting around on their blankets like a mass picnic I expected more of a carnival I guess with food and maybe some games or something On the opposite side of the river there was a concert hall where Martina McBride and Michael Chiklis performed along with some other instrumental performances I didn t go over there but it is more likely there were more entertaining things to do since that was the base for most of the events That s ok though I had plenty of studying time for the GRE I am just glad I remembered to bring my book If I were to go again and opt out of the concert related festivities I would get there 2 hours early instead of 5 The flyover was cool and the fireworks were great I expected the grande finale to be a lot grander It struck me as being incredibly short But it was still a fun night out Today a high school friend of mine was visiting Harvard with a group of kids she is teaching this summer through a program at Yale so we got to meet up and take a couple pictures at Harvard It is so fun and exciting to share this place with someone from home Not to mention spending time with a great friend Although we both had to work today it was great seeing her I am also going to see her during a trip we are taking to Providence Since it is about half way between Yale and Harvard we are going to meet up the weekend before my birthday to celebrate I am really looking forward to it I also found out this week that a college friend of mine is going to be on the east coast to check out some grad schools and she is organizing a stop in Boston to see me for a few days That should be a ton of fun too I cannot overstate how much fun it is to share new places with people who actually know you instead of the the friends that I just met This turned into a considerably longer post than I intended so I guess I will update once we get over this next step I hope we do soon because these P waves are starting to drive me a little crazy Link to Post Comment on this Post 1 Comments Drat July 1st 2011 Ok so

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/45 (2015-11-11)
    Open archived version from archive


  • IRIS Internship Program - Katherine Anarde
    periods As such the observed dispersion curves in Figures 20 and 21 cannot be explained solely through variations in water column depth or crustal thickness and must be interpreted as the result of shear wave velocity perturbations In addition the magnitude of the offset for each dispersion curve at ALL periods suggests that the velocity anomaly must be in the lithosphere and perhaps extends into the asthenosphere This is particularly evident for both Rayleigh dispersion curves when compared to forward models in section 3C This would make a lot more sense with pictures I d really like to upload my GMT stations plot as well Nothing seems to be working Link to Post Comment on this Post 1 Comments Lovin Love Waves July 19th 2010 Since my last blog I have flown through a TON of data processing As I stated earlier I ve been keeping a research journal Here s a selection from this past week not all figures not included The first step in data analysis involved measuring the relative phase of both Rayleigh and Love waves against a reference station for the land SIO and WHOI data The program Intdisp enabled me to align the phase of the transfer functions from each event per station and isolate it for further processing After completing all the measurements I found that less than 5 of the OBS data SIO and WHOI could be recovered for the next step due to noise As such I decided to focus on the measurements from the land stations which were less noisy and provided more accurate measurements Figures 18a c juxtapose Love wave measurements from a land station SIO and WHOI data from an event on day 219 in 2006 From the phase measurements I then used the program unwrapn to convert to phase velocity perturbation Through unwrapn I corrected each event for 2π problems that could affect the accuracy of the dispersion curves In the final stage of data preparation I used several programs to create dispersion curves for both Love and Rayleigh waves between all possible station path combinations The program run newlleg first calls an fcell with all the events and sorts which events are within 10 of the specified station path ex 75 76 Then the program run events calculates all of the dispersion curves and provides the azimuth distance from the great circle and the correction factor for each event per station path The correction factor is particularly important because it shows the correction for off great circle propogation meaning that all earthquakes do not actually approach the station along the two station great circle The final program run avepha averages all of the dispersion curves for each path and plots 2 new curves a simple and weighted average dispersion curve Figure 19 Figure 18a A Love wave phase measurement using Intdisp from the land station POHA The wave in the middle window is from the reference station BIG2 I am currently working on the Love wave processing

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/6 (2015-11-11)
    Open archived version from archive

  • IRIS Internship Program - Blaine Bockholt
    what actually happens My goal is to get through at least a month or two of data this week I also had my first field day on Friday Three of the 19 monitors in our array were flooded so we went out there and replaced the data acquisition equipment and had to raise the action packer boxes so they wouldn t flood again The array is about 2 5 hours away on a soy bean field and it only took us about 1 5 hours to change everything So we spent more time driving than we did actually working but that is okay it was pretty hot and I was done after almost 2 hours outside We than went and had lunch and I had catfish for the first time and it was amazing I love the food here and I will miss the food and the people when this is over As for the world cup I apologize I haven t really been following along It seems that everyone else in the world is but my wife and I are not I hope you all can forgive me considering I have nothing to contribute about the world cup on the blog nor on facebook I usually go have lunch with my wife and go sightseeing and go out to dinner with her and the little one in the evenings Again I apologize for my lack of enthusiasm Good luck all and see you in December Link to Post Comment on this Post 2 Comments New Computer June 21st 2010 Well much progress has been made during week two Chuck returned home from Salt Lake last Monday and we sat down for a little while a talked about a lot of things I had been working through some of his code and some code he downloaded from a PhD student in Alaska and it was my job to get both codes to work and then mess the two codes I got through both codes and got both of them working but on Tuesday I discovered that Alaska s code does not do what we thought needed it to do So we had to scrap that idea Plan B for the project was to get together with Heather another research professor here and she has a few matlab packages that may work What we are trying to do is pull data from our Antelope database into Matlab so we can work with it Currently we pull it from Antelope into SAC and then from SAC into Matlab This is a perfectly valid way of doing things but it is inefficient with time and memory For example one day of data has over 3 million data points for just one component of one station So you can imagine how much data we have for 19 stations with three components each So main goal at this time go straight from Antelope into Matlab So on Tuesday we talked with Heather and she gave

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/7 (2015-11-11)
    Open archived version from archive

  • IRIS Internship Program - Catherine Booth
    am already half way through this week and I have not even blogged about last week Time flies I have been using mb system to check out the Murray and Arguello Fracture Zones and San Pedro Basin Fault to see how well they have been mapped If we can deploy the OBSs on schedule we will probably map these features I ve been getting used to looking at multi beam bathymetry and navigation data and cleaning up noisy ship tracks The only slight drawback is the survey files can be large and it takes my code quite a while to compile Last week I went to UCLA with Dr Kohler to pick up a new laptop we will be taking with us on the cruise UCLA was a monster campus compared to Rowan I spent some time today copying final plots and making sure all of our programs run correctly on the new laptop On another note I am also starting a kind of spin off project that might follow me back to Rowan and I am excited I am going to do my best to explain it but Dr Kohler just told me about it yesterday and I will discuss it further with her in the next few days So to set up the scene here I was sad that I would not really be getting to work with that data that we are collecting on this cruise It s a year long experiment and when we return to Caltech I will be getting ready to head home anyway Dr Kohler proposed I try to develop a model that will predict what the travel time curve for our OBS stations and a few onshore stations will look like through the zone of compression I have to pick a hypothetical seismic event we are starting very simple and giving it a back azimuth of 270 degrees so the ray paths will arrive in the east west direction My first baby step is to make a grid of crustal thickness and corresponding velocity for each receiver location I have to take into consideration the high velocity anomaly in upper mantle below the Transverse Ranges and account for rays traveling through topography and different elevations I am going to back project rays from the receiver through the layers using Snell s law woot to the earthquake I m starting with a simple layer model with an even grid and then once I m comfortable with that we will revamp it and make it cooler The kind of long term goal is to perhaps set us up with some travel time residuals in the future I think my programming weapon of choice will be C Well that is all I know for now Oh and I cannot wait for the research cruise only a couple of weeks Link to Post Comment on this Post 0 Comments One third down July 19th 2010 The first third of my internship is officially completed I thought I should take a moment to look back on my initial plan and see where I stand I am comfortable using Linux and GMT I am still reading papers on previous work and background on the area where we will be deploying the OBSs but I do feel I have a much stronger foundation on the subject I finished looking at magnetic and gravity datasets and managed to create some nice plots W O O T I learned about the corrections made to raw data and the instruments we will be using on the cruise Currently I am finishing the mb system tutorial and figuring out how to edit and process multi beam bathymetry data I m encountering fun things like pitch and roll corrections and sound velocity profiles There is just so much to learn and time keeps flying As a whole I feel I am where I should be I deviated slightly from my original plan by finishing the magnetic and gravity maps before moving onto mastering mb system but I think my progression still worked I have four weeks until the cruise and I am heading toward producing ship track bathymetry maps If I keep to the plan in the next two weeks I will be ready to develop the final version Then I can prepare for two weeks on the high seas On a personal note I am really enjoying this internship and sunny California Santa Monica And the Caltech turtles Link to Post Comment on this Post 1 Comments Week Three and more GMT July 14th 2010 Well a fourth of my internship is completed Time is just cruising along I have a great book on marine geophysics and I ve been reading about the corrections made to raw magnetic and gravity field data and learning about the instrumentation we will be using on our cruise Since I have been looking at datasets and mapping I figure I should know what I m working with and how it is collected Most of the week I have been datum hunting I looked at databases for magnetic and gravity field ship track data and added to my maps I went a little cross eyed after staring at the computer for hours A small price for thorough and complete data I think I have exhausted most of my online resources so fingers crossed my gravity and magnetic maps are practically finished I have a cute script and I love awk I have a few minor adjustments to make like adding labels to the plotted OBS stations So to recap I have ship track maps of the free air gravity field and residual magnetic field of the area we will be deploying the OBSs I also made a low resolution but still kind of fun etopo1 topography map and a magnetic intensity map from the GeoNet data repository The latter two maps do not have any holes in the data so they are nice to look at I found

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/8 (2015-11-11)
    Open archived version from archive

  • IRIS Internship Program - Daniel Bowden
    magnetic field we get a signal a pseudo seismometer Since the teleseism should affect all of them the same unlike all the rest of the data that comes from very local noise we can find out if the stations data are at least on the same page same order of magnitude We ll see So far I have only just begun by playing with downloading seismic data both with breq fast and SOD with help from grad students and our very own Kelsey Link to Post Comment on this Post 1 Comments Summer Underway June 24th 2010 The second week for me here is almost completed and although things are pretty quiet here I ve been keeping plenty busy We finally got our matlab software GUI to download and convert all our MT data from Berkeley magneto telluric refers to both magnetic and electric fields measured Its been a pretty steep learning curve in UNIX and networking and public key cryptography The network administrator for the crustal geophysics group is a grad student who go figure is out in the field thanks again Kelsey But one learns more by doing it themselves right Then there s the actual signal analysis which I ve only begun to scratch the surface of All the electric and magnetic data is buried in noise for the 22 hours every day that BART is running BART is the local Bay Area transit system which powers their trains by sending current on the third rail Go figure sending huge amounts of electric current along the ground at high voltage without any shielding would throw off our highly sensitive measuring equipment We re talking about hundreds of square kilometers of area that this affects On another note I ve hopefully settled on ideas for a project that I can call my own over the summer While the seismometers have been well calibrated and tested the magnetic coils in the ground haven t been checked in awhile MT equipment is very well developed and used in industry as an exploratory technique but not as often permanently installed to look at long term trends We fully understand how they work and how well they should respond to a local magnetic field but we re not sure if some of the connections have degraded over time nor do we understand all the finer points of its setup ex is it better to bury the coil or mount it on a concrete slab Both will measure local variations but what to what magnitude in SI units So I ve been challenged to design an induction coil to create our own magnetic field start with a 9V car battery and make a low freq 1Hz magnetic field Then we take it to the sites and see if what is measured is what we expect I m excited by this project because it should provide a good range of activities from designing basic circuitry to field deployment to computer analysis it ll take a little work to filter out the field we create from all the other noise and then compare magnitudes And all very hands on which I definitely appreciate On a more personal note I m having a good time settling in to the bay area I ve been getting to know my undergrad counterpart a stanford undergrad working on the same project as well as the other students in our offices I m staying with family which is always nice and my girlfriend is in the area working for the summer at a German summer school camp I signed up for membership at a local rock climbing gym and also just picked up a used road bike to help with the daily commute should be solid couple hours of exercise each day Tomorrow should be my first day really getting dirty out in the field shovel in hand We ll be driving up to the Marin Headlands just north of the golden gate bridge We need to pull up one of the buried magnetic coils there and swap it with a working one Time to get to work Link to Post Comment on this Post 3 Comments Finally to work June 15th 2010 Finals in San Diego are finished and every personal belonging moved to the north I reported for my first day yesterday at the USGS here in Menlo Park right close to the Stanford Campus and met the crew there Darcy was very warm and welcoming as was everyone I met Looks like there s alot of different aspects to this whole project so while Simon Klemperer is still my go to advisor I ll be going to lots of other people thoughout the summer The E M half of things is rather underdeveloped as compared the huge world of seismology but that just means I get to learn about litteraly EVERY step of the way from collection to processing from the very same people who developed it The project to describe as simply as I can is to compare E M data collected by the magnetic coils and electrode pairs that we maintain to the seismic broadband station immediately adjacent technically maintained by the Berkeley guys The project tech Aaron showed me two of the sites yesterday one right by Stanford and another close to Berkeley have you ever been out to the BRIB station Rob So in addition to whatever research aspect I choose to pursue a couple days a week I ll be helping Aaron and the other undergad on the project out in the field fixing improving testing etc etc A student at Berkeley just custom designed his own Analog to Digital converter specifically for our purposes no small task and now it ll be a team effort to install and test the component which is actually the main focus of my undergrad counterpart on the project Henry Turns out tech Aaron was a UCSD physics undergrad back in the day exactly the same

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/9 (2015-11-11)
    Open archived version from archive

  • IRIS Internship Program - Zachary Chartrand
    that isn t straightforward enough I might try MATLAB and see if it s easier Outside of work I made it to UAF s Museum of the North The museum had sections on the native tribes animals fossils and rocks and minerals Animals of note were the Polar Bear and Grizzly aka Brown Bear which after being next to the stuffed variety made me very grateful that they weren t alive the Lynx the Arctic Fox and the wolf Rocks and minerals of note were these two large quartz crystals a Jade boulder about as wide as an office chair and as tall as the seat part some beautiful gemstones and a rough diamond with a very well defined octahedral shape I put the pictures on my laptop last night so I ll try to get them on Facebook soon Also Michael asked me a question on my second entry that I forgot to address last time Yes my brother and I both go to Mount Union In fact we room together with two of our friends on campus He s a physics major with a keen interest in acoustics Anyway I m sorry I don t update this as often as I should I ll try to get the next update in sooner Zach Link to Post Comment on this Post 2 Comments Week 3 in Alaska June 23rd 2010 Doug has gotten back from the IRIS meeting so things are starting to pick up around here Last week Mike was gone for a few days too so not much happened around the office at least with me While they were gon I spent my time getting more aquainted with dbloc2 and when I got stuck in that I went to learn more in MATLAB dbloc2 was giving Doug and myself some problems on Monday as well as it likes to get stuck and doesn t want to scroll to different events The next day Doug talked to one of the people here who locate earthquakes all day and found out how to solve these problems apparently changing the arrivals since time by a second does the trick Now that we can get dbloc2 to work I m reviewing these automated event picks which Mike set up on the last 3 months of data which has been recently uploaded to the database While these picks aren t perfect they re a good starting point on the new data as they show where the events are and saves a lot of time scanning through One thing Doug and I are having trouble with is finding grd files of bolivia which we need to make a station map of the area He s going to check and see if Cornell has any of these files as they are also working on this data and he s seen them with maps of the area so hopefully we ll get those soon Unfortunately I haven t been out exploring the area much Everytime

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/10 (2015-11-11)
    Open archived version from archive

  • IRIS Internship Program - Xenia Fave
    picking the unconformity we can map it in 3D and compare it to what we see for the Eocene If there are some trends present in both or even better yet if a fault is present in both then that would mean these faults were active in the past 170 000 years Unfortunately I actually left CERI today but Beatrice and I have discussed it and I am going to try and keep working on the horizons from home Hopefully it won t be too slow to run landmark on my computer I m keeping my fingers crossed on that account Then in October I am almost definitely going to head back up to Memphis and finish everything up In the meantime I ve also got to start writing my abstract which we re going to collaborate on remotely Additionally I downloaded ArcGIS Explorer onto my laptop This will allow me to look at and help interpret any new data Brian can find on my slightly mysterious geological time layer I m really glad I ve got the chance to come back because there is a lot more I would like to do with this project before calling it a wrap Its been an absolutely fantastic summer but I ll put those types of reflections in my next post Link to Post Comment on this Post 0 Comments When everything is working July 28th 2010 So last Thursday everything was looking pretty dismal Seisworks has two display views One is mapview which shows all the lines you upload as if you were looking at them from above In my case this makes a pretty rough looking grid The other is Seismic View which displays your data and allows you to pick your horizons My lines were all showing up in mapview but were coming up as big white rectangles in Seismic View A bit of a problem I came in and had a stroke of genius or maybe just a sudden urge to try anything new to fix the problem When we upload the data we have to select a value for the trace number and for the shot number I was using traceno and source respectively Switching these two fixed everything It doesn t make any sense but it was a hallejulah moment I don t know why it plays a role especially since in my case these two values are identical but I was so happy it was working I didnt question it The same day Beatrice and I realized that I had a problem with my mapview All of my data was being displayed as staircases instead of smooth lines This creates a problem when you re trying to pick a horizon because it lets a line cross another line twice which means the program thinks that place is in two places at once which doesnt make any sense We originally thought it might be because we had decimated the data taking only every 10th ping So Monday I removed all the decimations but still had staircases I began wondering if it was a problem with precision and so I increased the significant digits in the latitude and longitude files Then spent another couple hours of help editing the GMT script that converts the latitude and longitude to UTM coordinates until it also displayed another digit Sure enough much smoother and for lack of a better word prettier lines Since then I ve been going through each line and picking horizons and making sure they match up at every intersection Its what Beatrice called an exercise in patience I couldn t agree more Thank goodness for pandora Itunes grooveshark and lunch breaks Now my biggest problems are ensuring all my horizons line up As seen in the pictue below this is not always as easy as it sounds Its a little bit hard to pick out the yellow But the left screen shows one East West line and the right screen shows an intersecting North South line On each the yellow horizontal line segment is where i placed the top of the eocene before comparing then on the left screen seisworks plots my northsouth pick as a vertical line so i can see if it matches up with the eastwest pick and vice versa on the right screen clearly there are some huge differences and its hard to assume which one is more correct Headbanging and snack breaks result Link to Post Comment on this Post 0 Comments WOOO wait for it HOOOOOOOO July 22nd 2010 Everything works I fixed Seisworks this morning and everythings coming together More details to come I just didn t want you all to worry over the weekend Link to Post Comment on this Post 0 Comments Not a good day July 21st 2010 So After managing to upload all of my profiles to Landmark and getting ready to start interpreting them with seisworks Seisworks decided to have issues and not display most of our profiles The exception being the first east west line and the very first chirp line we ever did But neither guo lei s MCS data Onur s MCS data from the Caribbean or the other chirp lines would display So working with what we ve got I am now looking at the displays on Promax again writing down where the Eocene begins and ends and then print out those sections of profile Where I will write on paper where I see faults and pick my layers Additionally I will print out a map with GMT of the grid and label on it the eocene and exceptional faulting Then hopefully in the meantime the Seisworks problem will get fixed and if not there s a chance I ll be coming back up to Memphis sometime this upcoming semester to get the computer analyzing going Which would probably be the most work intensive couple of days of my life so far but isn t that what science is all about Computer bugs looming deadlines and insane manic nights that lead to the most amazing results I am going to make this work Link to Post Comment on this Post 2 Comments Openworks and Elvis July 20th 2010 IRIS BLOG Having completed my preliminary look through the data I proceeded to make navigation files for each line I used a workflow in Promax that read in the SEGY data output it in a Landmark Format Selected every 50th Ping in each file from which to create a database that we then converted to a spreadsheet So our final result was a spreadsheet with the shot number trace number Easting and Northing When I finished creating the spreadsheet Friday afternoon I wanted to try and map the grid lines we had done with GIS so we could get a feel for where in the river this had taken place etc I didn t have any issues getting the data into GIS but everytime I projected it GIS placed it very south of America let alone the Mississippi I tried several projections but with the same result and figured there had to be something wrong with our coordinates I compared my nav files with those of Guo Leis and found a huge difference Beatrice and I talked about it Monday morning and discovered that what we thought were Easting and Northing were actually arcseconds of Latitude and Longitude Fortuitiously she had a scrip on hand that would convert from Lat Long to UTM coordinates and so with a few minor modifications that problem was fixed I am now uploading these new navigation files and pairing them with their corresponding segy files in Openworks in order to get one step closer to interpretation Every time I upload a line it plots it on a map that already has the lines from their voyage two years ago so you can get a feel for everywhere we ve been Additionally this allows you to compare CHIRP data for one area with the local MCS data or data from the previous trip In other news my Mom s coming this weekend and we re headed to Graceland Elvis 75th birthday is this year so its a great time to be going We re also headed to the Memphis Zoo And of course a Riverboat Cruise Then there s the hodgepodge of restaurants stores and exploring downtown to look forward to with her Link to Post Comment on this Post 1 Comments Chirp Chirp CHIRP July 15th 2010 So since arriving back in Memphis I have been working on two things The Cruise Report This is basically done Guo Lei and I split up the writing and he did the Cruise Summary description of the MCS acquisition and the description of the Chirp acquisition I wrote up all the intro stuff cover page table of contents etc the Research Vessels section the Navigation and Track lines section and then edited and formatted both our halves to make them read and look uniform as well as reselecting pictures because even though we have about 1000 to choose from we chose four of the same pictures in our different sections We still need to do a couple figures with GMT or GIS and then I ll go through and renumber all the figures and make any changes and edits that Beatrice suggests Chirp Data Beatrice uploaded the Chirp data on Tuesday so since then I have been using Promax to go through each line there s 68 in total and diligently scanning and searching for any faulting folding or other regions of interest we may have missed Some of the lines come up great and you can really see a beautiful fault and others keep you guessing This is what my workstation looks like Link to Post Comment on this Post 0 Comments Beginning the Science July 5th 2010 We completed our river acquisition on July 1st Then on Friday we finished packing up everything we d put on the ship and putting it back in the van for Kirk and Steffen to return to the University of Texas I really enjoyed the time I spent on the boat I learned a ton about acquiring and processing marine data As well as handling emergencies with equipment But I am also very excited to begin the interpretation and analysis of the data we collected Beatrice and I met today to discuss my project for the summer My first two weeks are going to be spent bringing in all the seg y data we have from the Chirp into Landmark While I m bringing it all in I am going to be looking through all of the Chirp data for interesting features This includes the region I previously mentioned where the Claiborne was covered in faults I will be determining the strike and dip of this region and possibly even the stresses that would be necessary to produce the numerous faults we saw There were a couple other places we noticed as we moonwalked down the Mississippi where the Claiborne also was very visible so I ll certainly be taking a look at those Then there were sections of the river when no one was watching the Chirp so we have no idea if anything was there or not so it will be my responsibility to play the whole trip back and perform and in depth search for anything and everything of consequence Once all the data has been brought into Landmark and I ve scanned through it I am going to begin creating a 3D profile of the Claiborne section as well as interpreting other areas of note Meanwhile Guolei will be bringing in and interpreting the streamer data we collected So while I will be looking intensely at shallower formations he will be looking at every layer including the cretaceous paleozoic etc Interpretation should take another two weeks and then we re going to take a real look at everything we ve got and begin the analysis and I ll hopefully start writing my abstract and planning my poster for AGU with the direction we re choosing to take Alongside all of this Guolei and I will be working together to write the official trip report for this project This will be a daily log of the events that occured along with a detailed explanation of exactly how we did everything We already began on the boat by taking pictures of the setup we had for the streamer airgun and chirp as well as measuring exactly where everything was in relation to the barge and the Strong Guolei made detailed diagrams with the dimensions and objects which will be included in the report Link to Post Comment on this Post 2 Comments More Technical Difficulties June 27th 2010 So we were riding along on our merry way down the Mississippi when fate handed us a bad card The streamer got caught on something underwater We got the boat to stop in time so that we didn t run over it but still created enough stress on it that the streamer snapped Then when the Tiger Shark started reeling it in from the buoy end of things the rope also snapped This left out poor streamer caught underwater We tried searching for it with a boat hook and then a grappling hook that the chief engineer quickly constructed but to no avail The next day they sent another small boat with sonar mapping to go look for it and the good news is that its still caught at the same place and hasn t started drifting down to Louisiana the bad news is they still weren t able to get it up Luckily we had a spare streamer which is a bit older on board so we re still collecting data Interestingly enough when we compared the last couple hundred meters of data we collected with the first streamer to the first few hundred we collected with the second streamer the second streamer gave us much better results The streamers are identical in theory and the area we covered was the same so I would like to believe that it was my amazing processing skills that made the difference since I only did the second line but its rather unlikely Today I also had the opportunity to take Brian our hydrologist and my co buoy watcher through all the steps that we do to process the data beginning with creating a nav file from our gps and geode information all the way through an fk migration It was great because by teaching it I discovered a lot of small details I had never questioned before and Brian asked great questions so Steffen came over to help us really understand a lot of the different steps As a result even though I thought I had a great grasp of what was going on I now have an even better understanding of why we do so many steps We could even stop it between each new module so that we could see the difference between the before and after We did have a small hiccup today with the airgun when it stopped shooting properly We brought it on deck and indoors and Steffen began taking it completely apart while all of us watched He replaced a couple o rings cleaned and lubricated everything and we were set to go It started working just fine after that So although this gave us a small time delay about an hour I was glad that I got to see what the inside of the airgun looks like and how it all works together Link to Post Comment on this Post 1 Comments Pictures from the Ol Miss June 21st 2010 So we found a new fault More like a set of faults really We were drifting backwards down the Mississippi when it showed up on our CHIRP data Its unbelievably clear Also it appears in the Claiborne layers which is where the aquifer is that provides water to Memphis and the rest of the region So this is really a big find The CHIRP is a single channel device with both the sender and receiver directly on it It emits a noise that sounds sort of like a chirp which is of course where it receives its name It gets very high resolution data on the first 10 30m but becomes very noisy after wards Because of how interesting and important this find was we decided to spend the next day recrossing the area with just the CHIRP So on Friday we made five North South and five East West passes over these faults From the data we can tell it is dipping towards the North and East Beatrice and I have discussed it and she thinks it would be a great region for me to focus on this summer So when we return to Memphis I am going to have to figure out how to put CHIRP data into the landmark software and produce a 3D map of the surface More details forthcoming In other news I finally moved a lot of my pictures from my phone to the computer and have begun posting them on facebook along with a few good ones here The Strong The Tiger Shark The Barge with the streamer and airgun being pulled behind it Link to Post Comment on this Post 3 Comments Poison Ivy and Air inside of Air June 16th 2010 Typical Day So It s been almost a week on the river Basically my days begin at 530 when i wake up to get ready for breakfast at 6 to leave the hotel at 630 Then we drive out to a port board the Tiger Shark a small boat that helps us out all day pictures to follow and enjoy the windy ride to the Strong Upon arrival the Strong will drive to wherever we

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/11 (2015-11-11)
    Open archived version from archive

  • IRIS Internship Program - Nick Mancinelli
    me spend the day researching different instrument types Part of my project is to compare the short period 40Ts and L22s with the broadband CMG3Ts I am also still waiting cough for Brian Terbush to email me info about the geophones that Kate will be using during the active source I have also spent a lot of time looking through Wikipedia articles on poles and zeros transfer functions complex variables and laplace transforms so that I can better understand how the waveforms are generated My understanding is that the system response can be completely defined by a set of poles and zeros along with a gain coefficient Lots of crazy math but that s why I signed up for physics In other news I lost 10 cents betting on Portugal yesterday And I still have splinters in my left palm from fieldwork Other than that life is good I will be leaving CU this weekend to go to my cousin s wedding in Kansas City Fun stuff Link to Post Comment on this Post 2 Comments Blogging June 22nd 2010 Today is my second day in the computer lab I have just successfully created my first broadband station Probability Density Functions PDF s Took all morning for the CPU to churn through a few months of data for only one station The CPU will process 4 more stations overnight Zhaohui keeps giving me papers to read while I am waiting for the data to process Lots of papers on ambient noise characterization low noise models high noise models PQLX methods PQLX s save feature keeps causing PQLX to crash so we had to dig out some old c shell scripts my favorite one extracts the statistical curves we even fixed up one of Zhaohui s old GMT scripts pretty plots on their way Link to Post Comment on this Post 3 Comments Dirty Annie s June 14th 2010 It has taken me almost a full week to arrive at Buffalo WY where I will be stationed for a majority of my fieldwork Dr Steve Harder a man of few words who is in charge of the active source seismic component drove me from Salt Lake to Rock Springs WY where we met up with the driller We stayed the night at Motel 6 which to nobody s surprise much resembled Baca The next day we drove drove to Shell where I was dropped off at an old Japanese internment camp that has been transformed into Iowa State s Geology Field camp There I met Dr Kate Miller s PhD student Lindsay and the rest of her crew It is still snowing hard in the high mountain passes of the Bighorns The snow and rain is keeping us from installing the rest of the short period seismometers and the driller refuses to take his rig on snowy roads Hopefully the weather will improve during the coming weeks I spent the night at Shell with Kate s crew and the next morning

    Original URL path: http://www.iris.edu/hq/internship/blogs/user/12 (2015-11-11)
    Open archived version from archive



  •