GEOL 303 Lecture Notes - Lecture 20: 1989 Loma Prieta Earthquake, Interstate 880, 1992 Landers Earthquake
Document Summary
Epicenter in the santa cruz mountains, 80 km south of san francisco. 67 deaths and billion in property damage. Most damage was in san francisco and oakland: Collapse was over soft mud, which is not good to build on. At a time when city is hosting a major sporting event. Huge landers earthquake (7. 5m) occurred in a remote area east of san bernardino on june 28, 1992. This earthquake appears to have triggered another three hours, a 6. 5m event near the mountain resort of big. Little damage and only one death directly from the earthquake. These earthquakes did not occur on the san andreas plate boundary, but rather north of the san andreas fault on two other faults delineated by epicenters of thousands of aftershocks. Pie-shaped area between the faults had moved to the northeast by 18 feet, thus reducing fictional pressure on the. San andreas fault, in an area of high built-up stress.
