EPS C20 Lecture Notes - Lecture 19: Seismic Magnitude Scales, 1989 Loma Prieta Earthquake, Strong Ground Motion

• School: Berkeley
• Department: Earth And Planetary Science
• Course: EPS C20
• Professor: Richard Allen

Document Summary

Most plate boundaries are not perfectly translational, compressional or extensional. The concept behind earthquake forecasting in elastic rebound theory. Displacement across the san andreas in the 50 years prior to 1906 was. Max displacement during 1906 was 6. 5 m. The rate of plate motion i. e. strain across the fault. We can use the long-term processes to estimate the probability of earthquakesthis is earthquake forecasting. Serious if your building sits across the fault, but few buildings are on faults. Affects a much wider area causing most of the damage. Since the 1906 earthquake, no major earthquake has been centered near a densely urbanized part of the san francisco bay area. The m6. 9 loma prieta earthquake was centered in the mountains. The 1995 m6. 9 kobe earthquake struck a similar bay-sode urbanized area. Over 6000 people died & the damage exceeded bill. Statewide: 99% chance of m 6. 7. San francisco region: 63% chance of m 6. 7.