To determine the epicenter of an earthquake we need to use 3 seismograph readings and subtract the time difference between the p and s wave. Then use your ESRT to find the distance from the seismic station. Use your compass to draw a circle around the seismic station according to each distance. Triangulate the point by finding where the circles intersect for the exact epicenter.
Homework Problem The difference in arrival times for P and Swaves from an earthquake is 5.0 minutes. According to the Earth Science Reference Tables, how far away is the epicenter of the earthquake? A) 2.6 x 103 km B) 8.1 x 103 km C) 3.5 x 103 km D) 1.3 x 103 km
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April 2010
