To determine the epi-center 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 epi-center.
The difference in arrival times for P- and S-waves from an
earthquake is 5.0 minutes. According to the Earth Science
Reference Tables, how far away is the epicenter of the
A) 2.6 x 103 km
B) 8.1 x 103 km
C) 3.5 x 103 km
D) 1.3 x 103 km