The Average “Great” Earthquake

The cover article of Cole Hardware’s Hardware Hotline for October 2008 starts out like so:

Shake up SF: Be prepared for a quake

October 21, 2008 marks the 140th anniversary of the 1868 Hayaward Earthquake, the first great “San Francisco earthquake” and one of the most damaging earthquakes in the nation’s history. The average interval between the past five large earthquakes, on the Hayward Fault, is 140 years.

Hmm, maybe I should go buy a flashlight or something.

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