Laboratory Manual for Introductory Geology 4e

EXERCISE 11.4
Locating an Earthquake’s Epicenter and Determining When It Occurred (continued)
Name:
Course:
Section:
Date:
Arrival times and delays between seismic waves.
Seismic wave arrival times Seattle Boston Los Angeles
P-wave
S-wave
L-wave
R-wave
Delays between seismic waves
S–P
L–S
R-L
Step 3: Estimating Distance from the Epicenter to Each Station Using the Travel-Time Diagram
The next figure in this exercise shows how to use seismic wave delay data and the travel-time diagram to measure
the distance from each station to the epicenter. Start with one of the stations and then repeat the procedure for the
others. Draw a horizontal arrow to represent the P-wave arrival anywhere near the bottom on a station worksheet
(Appendix 11.1)or create your own scale using a separate sheet of paper. In this case, make sure to copy the scales in
the worksheets exactly. Then indicate the arrival times of the S-, L-, and R-waves using the time delays you recorded
in the table.
(continued)
286 CHAPTER 11 EARTHQUAKES AND SEISMOLOGY