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In 1971, the magnitude 6.6 San Fernando (Sylmar) earthquake in California caused extensive property damage and the death of more than 50 people. Much of the damage was due to failure of buildings which were built directly on fault lines which ruptured during the earthquake. The following year, Governor Ronald Reagan established the Governor's Earthquake Council whose recommendations led to the Alquist-Priolo Special Studies Zone (AP) Act which was signed into law in 1972.

Hospital in Sylmar, CA after the 1971 magnitude 6.7 San Fernando Earthquake

U.S. Geological Survey, General Information Product 15, 2005

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