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Roadway displacement near San Francisco. Road embankments were often broken by faulting or by the shaking of soft ground beneath them. Those roads built over marshes within the high intensity zone were particularly prone to cracking. Image Credit: U.S. Geological Survey April 18, 1906 San Francisco USA earthquake The 1906 San Francisco earthquake was the largest event (magnitude 8.3) to occur in the conterminous United States in the 20th Century. Recent estimates indicate that as many as 3,000 people lost their lives in the earthquake and ensuing fire. In terms of 1906 dollars, the total property damage amounted to about $24 million from the earthquake and $350 million from the fire. The fire destroyed 28,000 buildings in a 520-block area of San Francisco. Event Data:
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