This preview shows page 1. Sign up to view the full content.
Unformatted text preview: down rolling motion and the side-to-side vibration. 8.) The point on the Earths surface above the focus is the epicenter. Geologists used a time-travel curve to calculate the distance between an earthquake epicenter and a seismograph. To make this curve, a number of seismic stations at different locations record the time of arrival of seismic waves from an earthquake with a known epicenter and occurrence time. Then a graph is drawn using this data. This graph can then be used to measure the distance between a recording station and an earthquake whose epicenter is unknown. 11.) Only shallow earthquakes occur along the Mid-Oceanic Ridge because here the asthenosphere rises to levels as shallow as 10 to 15 kilometers below Earths surface and is too hot and plastic to fracture....
View Full Document
This note was uploaded on 02/13/2011 for the course ESC 1000 taught by Professor Staff during the Fall '08 term at University of Florida.
- Fall '08