The goal is to expand the data set by Tkalcic and Romanowicz (2002) by using seismic stations and earthquakes in areas not initially used. Because of the ten-year difference between the initial data set, we are able to utilize the new data recorded at the newer seismic stations, in particular in Australia and Antarctica. In this study, over 480 measurements were made. Although more observational work still needs to be done in finding events that produce good PcP-P and ScS-S, we are beginning to fill in the “holes” of the existing spatial coverage. Events in locations such as the Mediterranean Sea add to the velocity model particularly in the northern Atlantic Ocean. In the new data set, the largest negative PcP-P residuals are located along the coast of Antarctica and between Alaska and Russia. These larger negative residuals indicate significantly faster paths through the lowermost mantle. When compared to some whole-mantle P-wave velocity models, the acquired data appears to coincide with the models in many areas. The surface projections of the bounce points in east Asia and North America show fast patches at the CMB which fit previous models. After analyzing PcP-P, we moved onto ScS-S to compare the former residuals with the latter to presume the nature of the heterogeneities. The measurements vary in comparison to those of PcP-P, as some are very close to their PcP-P counterparts, others are very different in magnitude, and even opposite in sign. Because of the locations of the chosen events, a high percentage of the data relates to the CMB beneath Asia and the Middle East.
Further analysis is necessary in order to fill in the bigger “holes” in the spatial coverage of the lowermost mantle. Large areas, mainly in the oceans, have yet to be examined. The difficulty in doing so comes from the lack of seismometer stations in these areas and the noisy data often retrieved from stations on islands. A possible solution to this problem would be the installation of borehole ocean bottom seismometers at key locations.
So in other news, My last day in the office, Friday the 19th, we're having a little potluck. I'm making chili in my rice cooker, cornbread, and macaroons. If you've never had a macaroon, you haven't lived. But anyway, Mallory is making hummus and bringing in veggies and pita bread to dip with, and I'm not sure what Surya is bringing. There's a new girl, a German exchange student who is doing the same sort of thing that we did (an internship through some German company) and she's bringing drinks. We're going to try to get Hrvoje to come too, because we're pretty sure that he'll make something delicious. But we'll see how that goes.
The Sunday before I leave I'll be doing my souvenir shopping for the people who demand Australian goodies from back home. There's this really cute market place in the suburb that I'll be staying in my last week, and they have a lot of cool things. So I'll be doing that.
All in all, I'm happy to have gone here, but I'm so excited to be going home soon. I didn't think I'd miss it as much as I do, and I really miss eating decently. I'm really sick of ramen. My roommate scolded me yesterday for not adding any veggies to my ramen, because it "isn't healthy". Ah well.
Alright, that's it for now!
So yeah, all set for San Francisco and AGU in December! Woo!
3 weeks left means I need to get on things. I have so much left to do! I have no idea if I'll be able to finish it in time, but I sure am going to try.
I have to move out of my apartment in 2 weeks as the owner of the room I'm renting is coming back, and I'll be staying at a bed and breakfast. I'm kind of excited, for one week it might seem like I'm actually on a working vacation. It'll be nice, I hope.
That's it for now, yeah, just wish me luck, will you?
So one of the things Hrvoje asked me to do was record sections of my PcP-P traces. After a long hard battle with GMT and C Shell, I was able to make one for each event and they came out nice. Here's one:
This is the best PcP-P event I found, and it was cool because it was in the Mediterranean, which Hrvoje's data set didn't include much of. So I lucked out!
Next stop: P and PcP ray paths through tomographic models!
So I went in to work today to get some things done. I think I must socialize with my office mates more than I realized, because I got far more done when they weren't there! But, anyway, I finished my PcP-P measurements for all 27 events, 3 of which were total crap, but my goal was to get at least 10 decent events. It turned out that my criteria for picking events in hopes of finding good PcP was very good. Anyway, I finished the measurements, wrote a program that organized them all based on the quality of the measurement, and created ps files for all of the Grade 1 and 2 measurements. Hrvoje wants me to print them out, which disturbs me slightly because it's so much wasted paper! But still, I'll get over it. After that, I took my measurements from each event and plotted them all into ps files, to show which events were the best, which ones sucked, etc. Then, I took all of the data and plotted it all onto a map, first which just Grade 1 quality measurements and then with Grade 1 and 2. AFTER THAT.... I wrote another GMT script to plot my PcP-P residuals with Hrvoje's. Here's what I have:
These are Hrvoje's events from his 2002 data set. I used Adobe illustrator to show the major holes in the data so that I could see if I had achieved my goal of having helped fill in the holes.
Then, I plotted my events using the same holes, to see where I had filled in:
Then I showed the holes that still need to be filled in:
So yeah, that's what I did on my Saturday.
So this past week has been difficult. I've been sick for the last two, and I haven't gotten much opportunity to sit back and enjoy the stuff that's going on, but things are getting better. Here's the update:
That's all I have for now. Once I start plotting more I'll post some pictures for you all to see
This is the map of events. The red stars indicate all of the events from 2001-2009 that satisfy my criteria of occurring <80km and have at least a 5.8 body magnitude. The blue stars are the events previously done by Hrvoje prior to 2001 which satisfy my criteria and the yellow stars are Hrvoje's events that do not. The Green diamonds are the events I chose to do. In total, there are 27 of them.
The next picture is a map of the stations of my best event thus far. It took place in the Mediterranean. The stations are marked as green triangles and the reflection points are marked with circles or triangles, depending on the residual. The residual is calculated by subracting the predicted PcP-P from the observed PcP-P. If a residual is negative, it means that the PcP wave was fast or the P wave was slow, and if it is positive, it means that the PcP was slow or the P wave was fast.
Here's the revised picture, I took Rob's advice to change the color of the symbols. I intend on comparing it to the tomographic model when I finish my measurements.
I then wrote a little bit of a rough draft of an "abstract" for my project. I did it so that I could practice talking about my project so that I could actually say I know what it is I'm doing, and Hrvoje also wanted a sample of my scientific writing for the rubric thing. It seems okay, it definitely needs work and expansion, but I think that it is a good start. It's posted as my "profile" project description, just in case any of you want to give me any tips
So now that it's Friday I'm pretty worn out from the week. I need to finish my 5th event today and maybe a sixth, but so far I'm procrastinating. I'm exhausted, despite going to bed at 9pm.
On a very happy note, I got a care package from my family which included the essentials, like ramen, easy mac, and some shampoo and conditioner. However, they also included some tiny boxes of cereal and my favorite flavor of oatmeal It was definitely the best thing I've come home to since coming here!
So Harry Potter is coming out on July 13 at 12:01 AM, and I'm wondering really which day that is. Because obviously. technically, that will be like Tuesday night, but it might not be... meh... I'm confused. I'm going to ask somebody I think haha.
So another note on the project, my first event showed decent PcP, my second event showed excellent PcP, my third event was okay, but the fourth event showed nothing. So I'm hoping the 5th will yield better results and that I will find the 10-15 events necessary to have a successful project. Out of the 27 I chose to look at, I'm hoping that at least 10 turn out decent, but I would be happy to see 15 of them. So far I'm thinking that 3/4 events have been good, so hopefully the trend will continue!
So that's about all I have I'll post more when I know more.
I'm really excited about it, and I'm hoping that the other events give me just as nice wave forms. I'm sure you all know that feeling of elation when waves which are supposed to align perfectly do So happy.
So Yeah that's my quick update!
Sydney this weekend was pretty cool. I walked around quite a lot and soaked in the sights and tourist traps, which made it a lot of fun. Specifically, Manly Beach was lovely. There were a lot of cool things to see and shops to browse at. Although, I went into a shop near Darling Harbour and knocked down and nearly broke about 300$ worth of Aborginal pottery. Luckily none of it broke.
But anyway, it was fun, and I figured I'd leave this picture. This little guy flew to join me while I was eating lunch, supposedly "The Best Meat Pies in Sydney!".
He seemed a little skeptical too.
Anyway, so I was given Friday off because Hrvoje is going to a conference in Melbourne for a week, so I decided I'm going to Sydney this weekend. I'm excited, and a little nervous, because if I can't find someone to go with I'll be alone. I'm hoping one of my new friends will be game!
Aside from this, all I can say is that in my meeting today I had the best conversation about how much of our "knowlege" of the compositions of other planets is all speculation. It excited me that something I'm really interested in has so much work to be done. Although, in order to know more about other planets we first really need to learn what the heck's going on in our interior, so here's to working on that!
But now it's Friday, almost time for my 2nd weekly meeting, and I'm feeling confident. I have printed record sections of my PcP waves as well as a really colorful and pretty map of the world with red stars indicating possible events from 2001-2009 that fit my criteria of a.) being a deep event and b.) have a body magnitude of 5.8 and above. The map also has stars plotting the events that hrvoje used in his data set from before 2001. When I figure out how (right now all I have is this tiny textbox and my pro-skills in html coding to make this pretty) I will post the map. It's pretty, and what's better than that?
Anyway, I am hoping this meeting goes better than last weeks, although I'm convinced it will. Things are going much smoother now that I'm learning how to code in C Shell and now that I can make working SAC macros.
A side note: When trying to determine the possible events that I could use, the original approach was to go through them one by one using WILBUR, but then I thought using GMT (if only I could figure out how!) to plot them using the EHB catalog. Mallory, the PhD student who is working on about the same thing helped me do it, and then mentioned that she hadn't thought of doing that, and has been doing it the long hard way for a long time, and she was as excited as I was. So I felt good about that!
Aside from the sciencey crap, socially it's gotten a lot easier around here. I made a few friends in town, and now that I know people I don't have to adventure alone. Although 2 of these friends tried to trick me into believing in "drop bears". Drop Bears are apparently an imaginary deadly animal that Aussie's like to tell dumb Americans about, because usually they believe them. Luckily, on both occasions, I not only didn't believe it, but I told them that I "don't get the joke". So ha!
Also, the animals here are amazing. The birds amaze me, because a lot of them are pets in the US. Expensive pets, at that! Cockatoos and parrots, flock all over the place! It's really crazy. I was told that there are like, tons of rabbits everywhere, as they are an invasive species, but I have yet to see one. Kangaroos, though, live right up the street from me, so I usually see them hopping around.
Another note of awesomeness: Harry Potter 7 Part 2 comes out here first, and since my friends are apart of the campus Harry Potter club, which rented out the theater for the midnight release, I might be able to snag a ticket! Ahhh so excited!
We went to this amazing Indian restaurant last night, and got the "banquet" option, and I ate, and was full, and then they brought out the main course. I was sooooo full afterward.
What else... Oh, there was a fire in Canberra yesterday, and the smoke has spread all over the suburbs. You can't really see the sun today, the smoke is that thick, but also the building that was on fire is still smoldering as of this morning.
That's all I have to report!
However, even though I figured this stuff out, I have so much more to learn before I can really do my project stuff. But this is still super exciting! Yay!
I've already made a mess of things, like all physicists do....
So the first day went smoothly. I met a couple people working in the same office as I am, specifically Mallory, who is from the states, and (A name I can't pronounce or spell at the moment) who spends every waking second of his at his computer working on his PhD. Things went well, my project is somewhat planned out, I started some reading and when I got bored I played with the linux and when I got bored of that.... I secretly played a little solitaire. But all in all, a really decent day.
BUT. Then came Thursday. I got up at 6AM, left the house at 7AM, and did not get to the building until... oh... I don't know 10:15. First, I got on the wrong bus and it brought me to the southern edge of Canberra in a suburb I can't pronounce (Tuggeranong?) and then jumped on a bus back to the city. Then couldn't find a bus that brought me close enough to my building... So I ended up on the complete wrong side of campus and I forgot my map book on my desk the day before.... UGH!
So then I got there. People were cool. In fact no one cared. But then I went to log in.... and... well... the computer froze.... So we restarted it? ....nothing. So then the IT guy came up, sat on it for about an hour, and at that point I said screw it and went to lunch. I got back, no IT guy, no working computer, no anything. Mallory told me to just print out some papers to read at home.
So I went home. Well, went shopping while in the city but then went home and sulked. So now here I am, a little annoyed but otherwise okay, and I'm going to try and read those papers.
But here's some important things regarding my project. Mallory has a bunch of scripts that will help me with the mapping and data analysis, so I don't have to reinvent the wheel so to speak. I just learned how to request data through Iris, and hopefully will be able to figure out how to use it.
My computer while it was working. His name is Moho.
So... aside from seeing my first kangaroo, this is all I really have to report.
So it's been a week of fun and crazy things I never thought I'd do. I never thought I'd make it through the 8 mile hike, but I did it. And I think that it will help me demonstrate fortitude and perserverence throughout the summer. I'm really nervous about meeting my host, and getting to know my housemates. I'm hoping people there are as awesome as they were here! I already miss everyone. We had a lot of fun staying up way later than we should (or wanted to, for that matter!).
It was so wonderful getting to know all of my fellow interns, and by the end of last night it was obvious that the AGU alumni reunion thingy will be off the hook!
Just curious to those of you who reading this have met your hosts, how are they in relation to what you expected them to be?
K now to finish packing!
These are all goals I think I can accomplish if I work at them. I'm sure that there will be more and more that I'll need to add to this list once I find out more of what I'll be doing.