What happens to BART during an earthquake?

The BART server calculates the earthquake's seismic intensity within nanoseconds, and if the seismic intensity -- or MMI (Modified Mercalli Intensity Scale) -- is greater than IV, the server will automatically signal trains to reduce speeds. Trains then automatically begin slowing to 27 mph.



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Due to its location in the middle of San Francisco Bay, the Alcatraz Cellhouse is extremely vulnerable to earthquake damage and the corrosive effects of salty sea air.

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On March 21, 1963, USP Alcatraz closed after 29 years of operation. It did not close because of the disappearance of Morris and the Anglins (the decision to close the prison was made long before the three disappeared), but because the institution was too expensive to continue operating.

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The Alcatraz Swim is an approximately 2-mile swim from Alcatraz Island to the St. Francis Yacht Club in San Francisco.

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