Figures

Well, I have been able to get some figures made, though they are not the best. One problem that I came across in GMT is that when I do a post script file the title gets cut off. Also, on the histogram that I have done the x-axis label was being placed on the y-axis when it should have been the other way around. It was labeling the figure correctly when I first made the script, but for some odd reason the script no longer labels it correctly. I have since used Power Point to help make my figure, and to point out some of the interesting observations.

The numbers in scientific notation are in epoch seconds (epoch being the number of seconds from 1970 or something like that), and the numbers 0 to 60 are the frequency of the events within a 2-day period. I made the bins small to try and see if there is an increase in the frequency of earthquakes in the event of non-volcanic tremors (NVT). NVT happened, if I remember correctly, in July and in February. While there is some activity that occurs slightly before the tremor happens (sorry, I do not have that data to put in the figure) there also seemed to be a swarm of earthquakes that would happen about one to two days out of each month. In the event of a swarm the earthquake activity would remain accelerated for about a week after the each swarm. Locating all of those events was tedious. Histogram of Oaxacan events

This next figure shows the location of the 3119 events that were located in nine months worth of data. One item of note is how the seismicity generally follows the coastline. Most of the events that were located seemed to lay on the plate interface, about 19 to 25 km depth. The group just to the north (north being toward the top of the page) of OXEC tended to be about 55 km deep. As for the extreme simplicity of my map figure, I tried to get seemless data to make the map more pleasant to look upon, but they did not have the data.

Note: the swarms that took place in the area were usually around OXTT and shortly after the OXTT swarm OXET would start one. My professor, Mike Brudzinski, noted that the seismicity between OXTT and OXET is between the locations of large seismic events that happened in the recent history of the Oaxacan area.  

Map View of Oaxaca Earthquakes

I hope to have more figures in the future to post.

 

Nice figure. I like the

Nice figure. I like the apparent correlation between NVT and earthquake swarms, which seems particularly strong during the 2nd tremor episode. I would change the epoch seconds values to a more meaningful unit before AGU, like days or months. Finally, a topo grid would spruce up your map nicely. You can find the appropriate one here: http://www.gina.alaska.edu/page.xml?group=data&page=griddata

Do you have any ideas about what the earthquakes and NVTs are telling us about the geology of the region?