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The Loma Prieta earthquake occurred on October 17, 1989 at 5:04 p.m. Pacific Daylight Time. It had a moment magnitude of 6.9 and a surface wave magnitude of 7.1. The duration was 15 to 20 seconds. The earthquake occurred due to slip in either the San Andreas Fault or a subsidiary fault. Much of the displacment was vertical motion typical of reverse or thrust faults, according to Greg Beroza.
The epicenter was on the San Andreas fault roughly 56 miles south of San Francisco and 10 miles northeast of Santa Cruz, near Mt. Loma Prieta in the Santa Cruz Mountains. The focal depth was 11 miles (typical California earthquake focal depths are 4 to 6 miles). Loma Prleta ruptured the southernmost 30 miles of the break that caused the 1906 San Francisco Earthquake.
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The 1989 Loma Prieta earthquake ended decades of tranquillity in the San Francisco Bay region. It was a wakeup call to prepare for the potentially even more devastating shocks that are inevitable in the future. Since 1989, the work of the U.S. Geological Survey (USGS) and other organizations has improved understanding of the seismic threat in the Bay region, promoted awareness of earthquake.
Loma Prieta Earthquake of 1989 In eleven pages this October 17, 1989 San Francisco earthquake which registered 7.1 on the Richter scale is discussed in terms of the many challenges it presented. Eight sources are cited in the bibliography. Pages: 11.
The Embarcadero Freeway, torn down after the 1989 Loma Prieta earthquake. Photo: Gary Fong, Chronicle Staff How 1989 Loma Prieta quake changed San Francisco — for the better.
One of the most costly and damaging disasters in U.S. history, the 1989 Loma Prieta earthquake was the largest earthquake to strike California since 1952 and the most devastating to hit the San Francisco Bay Area since 1906. From the earliest hours following impact, as initial reconnaissance efforts got under way, it was evident that Loma Prieta would become an important case study for the.