How would an earthquake epicenter be located, using three ...

[bio_gurl]

How would an earthquake epicenter be located, using three seismograms, a map, and a protractor? What will be an ideal response?

Question 2

Describe surface waves and their most important two types. What will be an ideal response?

[ngr69]

Answer to Question 1

First, determine the difference in first arrival time for P- and S-waves for the three seismogram
locations. Second, using a time-distance graph, determine the distance the epicenter is from each of the
seismogram stations. Use a protractor to draw a circle whose radius equals the distance shown on the
time-distance graph from each of the seismic stations. The point where the three circles intersect is the
earthquake epicenter.

Answer to Question 2

Surface waves travel along the surface of the ground and are slower than body waves. They produce a
rolling or swaying motion. The most important types of surface waves are Reyleigh waves (R-waves),
which are the slower of the two and move material in an elliptical path, and Love waves (L-waves),
which move material back and forth in a horizontal plane.