My first week in Lafayette was definitely a good one. We are no longer living in a house with 6 other people, and I’m actually sleeping in a bed! Also, there is a free trolley that goes to and from campus near the house so I won’t have to buy a $28 bus pass for the month. Though realistically, I’ll probably just spend it all on food anyway. Speaking of food, Lafayette doesn’t have quite the selection that Bloomington had. Today, I ate lunch at an Indian restaurant called Khana Khazana and while it was pretty good, it was a little pricey… It looks like that $28 will be drying up pretty quickly here.
This week, I continued with my data processing in Matlab. Hersh gave me a few new scripts to play with that allowed me to look at my data a bit differently. I am now able to plot arrival times of the converted phases as a function of ray parameter for each station. This is useful because the relation between arrival time and ray parameter varies with the depth that the conversion took place, and that’s ultimately what I am interested in. I can then try to match the trends to the theoretical values for different velocities and depths to make a velocity model that matches the data. I’m also doing some forward modeling where I create a velocity modeling and run a program to generate synthetic data. I can then plug that synthetic data into the same Matlab script to see how it looks compared to the real data. If I am able to get a synthetic model that matches the real data then that should be a good indication that we are using an accurate enough velocity model.
Also, we finally talked with Kevin from the Indiana Geological Survey to get some information about the structure of the Illinois Basin. He has a very elaborate 3D, 7 layer model that describes the stratigraphy of the basin which we will incorporate into our velocity models. We will be trying to simplify this into a 2 or 3 layer model with the help of Gary back at IU. This week, I’ve been creating velocity models with different numbers of layers and running synthetic data to get a feeling for what happens for different numbers of layers in the model. Hopefully, next we will be able to work more with information from the 3D model to get a better idea for how we can simplify it for our needs.
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