Lab 9 Answers Nicholas DeNobrega
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Dec 6, 2023
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Nicholas DeNobrega
Lab 9 Locating Earthquakes
A51
1. Identify P and S waves on your seismograms.
Station TUC
What is the P arrival time?
3:21:30
What is the S arrival time?
3:23
Station COR
What is the P arrival time?
3:22:30
What is the S arrival time?
3:24:50
Station CCM
What is the P arrival time?
3:24:50
What is the S arrival time?
3:29
2.Determine the amount of time between arrival of the P and S wave (S minus P time) Station TUC: 1:30
Station COR: 2:20
Station CCM: 4:10
3.Determine the distance the epicenter is away from each station using the travel time curve. Station TUC 800
km
Station COR 1150 km
Station CCM: 2500
km
Do this by taking your S-P time (e.g. 4 minutes) and locate a position between the S and P lines on the graph that is 4 minutes apart.
4.
Enter the three station sites (latitude, longitude, distance) into the IRIS Triangulation interactive map. It will provide a location for you based on your interpretations. TUC: Latitude 32.31, Longitude -110.78, 800 km
COR: Latitude 44.59, Longitude –123.30, 1150 km
CCM: Latitude 38.06, Longitude –91.24, 2500 km
5.
What was the latitude and longitude of the location to which you have triangulated? Take a screen shot of your result and provide it to your TA.
Latitude 34.78, Longitude -118.92
6.
The actual location was very near Ridgecrest, CA. How close were you? Why might you have missed the location? In regards to being accurate, the location I estimated to be the epicenter was a little due west of Ridgecrest.
I might have missed the location due to measuring the arrival times of P and S arrival times for each station. Also after determining the time between the arrival of both, an error could have occurred when finding the travel time based on the curves of the travel time graph.
Part 2: Iterative earthquake location
1.
Global Earthquake: Turkey
2.
Special (Large Earthquake): North Korea
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