More than one million earthquakes occur annually, and most often they happen in remote areas or under the oceans. But sometimes earthquakes occur in populated areas, devastating cities and killing people. That's what happened on the morning of April 18, 1906 in San Francisco, California. The quake, with its epicenter offshore of San Francisco, lasted less than a minute but destroyed more than 35 thousand buildings and left more than 3 thousand people dead. The population of the city in 1906 reached 400 thousand people, and half of the San Francisco residents were left homeless after the great earthquake.

The quake was caused by a slip of the San Andreas Fault over a segment about 275 miles long, and shock waves could be felt from southern Oregon down to Los Angeles.

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