Question

EXERCISE 11,4 Locating an Earthquakes Epicenter and Determining When It Occurred (continued) Name Course Section: Date: Arrival times and delays between seismic waves Boston Los Angeles Seattle Selmic wave arrival times Delays between seismic waves S-P 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)

Answer 1

Seismograms for Exercise 11.4 (continued). Seattle, Washington 5:30:00 Boston, Massachusetts 5-30.00 Los Angeles, California

EXERCISE 11,4 Locating an Earthquakes Epicenter and Determining When It Occurred (continued) Name Course Section: Date: Arrival times and delays between seismic waves. Boston Los Angeles Seattle Selmic wave arrival times 5:42:20 5:40:00 5:09:20 5:40:40 5:43:00 5:12:40 5:46:20 5:43:15 5:14:20 5:48:00 5:44:20 5:15:00 Delays between seismic waves S-P 40sec 40sec 200sec 200sec 155sec 100sec 100sec 65sec 40sec 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)