Lab Exercise 16

Physical Geology Helpful Lab Hints

Exercise 16: Earthquakes

Problem 1.c.

The best way to prepare for this exercise is to complete the virtual earthquake exercise at http://64.239.9.13/VirtualEarthquake/ for extra credit.
1. Draw a line on the station A seismogram that shows where the mark would have been if no earthquake had occurred.
2. Measure the height (or depth) of the largest S-wave from the station A record above (or below) the line you drew. (measure in millimeters)
3. Using the graph on page 311, mark the distance from the epicenter to Station A (you should have this from 1.a.) on the right side and the amplitude you just measured on the right side. Connect the two points with a line, and read the magnitude from where the line you drew crosses the line in the middle of the graph.