Hypothetically, an earthquake with Richter scale 7.0 took place in Midwest region of the United States on a particular day.  Geologists approved that this earthquake was related to the New Madrid Fault.  The earthquake’s epicenter was located at downtown St Louis (Latitude 39 N, Longitude 90W), which was calculated based on the seismic waves received by the following seismic stations.     Station 1:  Seattle, WA, 2000 miles from St Louis Station 2:  Mexico City, Mexico, 1600 miles from St Louis Station 3:  Greenland, 2750 miles from St Louis Assuming that both P and S-waves traveled at a constant velocity from the epicenter to the seismic stations. When did this earthquake take place?  Please explain

Applications and Investigations in Earth Science (9th Edition)
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Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Hypothetically, an earthquake with Richter scale 7.0 took place in Midwest region of the United States on a particular day.  Geologists approved that this earthquake was related to the New Madrid Fault.  The earthquake’s epicenter was located at downtown St Louis (Latitude 39 N, Longitude 90W), which was calculated based on the seismic waves received by the following seismic stations.    

Station 1:  Seattle, WA, 2000 miles from St Louis

Station 2:  Mexico City, Mexico, 1600 miles from St Louis

Station 3:  Greenland, 2750 miles from St Louis

Assuming that both P and S-waves traveled at a constant velocity from the epicenter to the seismic stations. When did this earthquake take place?  Please explain.  

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