Currently I am starting inversion. I’m really excited to start putting all of the hard work and gruelling monotony of picking PmPs in the seismic data to use. The first few runs will be preliminary, and I will probably have to make some changes. However, after a few tweaks I’ll be able to produce a model I can work with. I might also find it necessary to make additional picks with more station/event combinations.
Since most of my time here has been making picks, there has been some challenges and success. The most challenging aspect has come from interpreting the seismic data when it gets very ‘noisy’. The geology of the mid-ocean ridge is quite complex so I get a lot of abnormal and sometimes hard to correlate results. Anytime I encounter something new and interesting William will help me find the PmPs, and that will usually help me correlate with the adjacent shot-lines. There has been a lot of success getting used to tlPicker though. I’ve managed to become very independent and quick in the program’s MATLAB menu and environment. Using the menu and tools I can quickly make the data easier to interpret, it’s just sometimes making it easy to look at still doesn’t make the complexity go away.
As I continue to pick PmPs on the seismic data I get ever closer to a finished product that I can use for inversion. I met with William and Dax, my mentor's graduate student, to discuss the gameplan for the next weeks ahead. I seem to be slightly ahead of schedule and should get to start on an inversion next week! I'm very excited to start on inversion. With inversion I will be able to model crustal thickness and get a better understanding of the areas at and near the ridge. While picking we have already encountered some interesting occourences that we can not explain very well. With the model we might be able to shed some light onto what we are seeing and address the important geological mysteries at hand.
Currently I have been working with a data set collected through R/V Marcus G. Langseth. The ship conducted an experiment on the Endeavour segment of the Juan de Fuca Ridge where 68 four-component, ocean bottom seismometers were deployed at 64 sites near and away from the mid-ocean ridge. We are working with researchers from the University of Oregon. We had a conference call the other day, and I got a screenshot for the blog! I am currently picking points from different station/event combinations that cross the ridge axis. It’s tedious work, but luckily the world cup just started today so I will have a healthy distraction to not keep from going crazy. We use a program developed by my mentor called tlPicker through MATLAB to make the picks. It is not very fancy, but it gets the job done, and is effective in what we need to do. I haven’t started seeing seismic data in my sleep, but I have been seeing flowers by Georgia O’keefe.. Black IRIS (no pun intended, although quite conspicuous) ... doesn’t it look a lot alike?? I’m not going crazy right??
Yes, the world cup is about to be in full swing, and while many goals will be scored in Brazil I have my own goals to score this summer...
1. Enhance my ability to navigate and use MATLAB and more specifically tlPicker. I will be picking a lot of PmP arrivals (estimated 30,000+). The faster I get at recognizing PmP arrivals and quicker at filtering the seismic refraction records the faster I will be able to get the bulk of my work done.
2. Enhancing my knowledge of the subject matter. I have a collection of six starting papers that will give me more insight into the lower crustal low velocity region and ocean ridges. I want to be able to enhance my reading comprehension of the area I’m studying, and be able to ask the BIG questions when I invert my data. (ie. map out the lower crustal thickness and lower velocity zones).
3. Conservatively, watch at least 90% of the World Cup. I have a dual-monitor setup and simply must take advantage of it. No seriously, a healthy work-life balance is important.
4. Gain Independence and Interdependence in a research environment. I want to develop the skills and knowledge to be able to work on my own for extended periods of time, but also not be afraid to ask questions to my mentor. I want to actually contribute ideas along side my work, not just information.
5. Experience Seattle. People have told me that this is the best time of the year to be living in Seattle.
I have never seen so much free food in my life!
Much Learning Such Wow.