ATOC 185 Lecture Notes - Lecture 1: Ground Vibrations, San Andreas Fault, Parkfield, California

• School: McGill University
• Department: Atmospheric & Oceanic Sciences
• Course: ATOC 185
• Professor: John Stix

Document Summary

Main type of fault in divergent margins, but there are others: reverse/thrust faults. One block is thrusted up: strike-slip faults. Small scale version of transform plate tectonic margins. Use upper block to decide which way. Strike-slip motion can offset rivers: faults can be a combination of the three. In a majority of cases, real faults have both vertical and horizontal faults. Elastic rebound theory: before fault rupture, rock deforms. A certain amount of stress forms before rupture. As stress builds up, one side wants to move one way and the other wants to move the other. Stress level builds up to a certain point and the rock breaks (fault ruptures: after rupture, rocks return to their original shape and stress level. Measures of earthquake: eve(cid:396)y 25 yea(cid:396)s, the(cid:396)e"s a(cid:374) ea(cid:396)th(cid:395)uake of the sa(cid:373)e (cid:373)ag(cid:374)itude, focus. Earthquake waves radiate from that point: richter magnitudes. Richter magnitude maximum measures the amplitude of ground shaking.