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Loma Prieta EarthquakeEssay Preview: Loma Prieta EarthquakeReport this essayOn October 17, 1989 at approximately 5:04 PM, a 7.1 magnitude earthquake shook the Oakland and San Francisco areas. The earthquake lasted for 20 seconds. The epicenter was located approximately 60 miles south of San Francisco, and could be felt hundreds of miles away. Two major factors.