the 1906 san francisco earthquake is the largest earthquake in the united states.
what's the largest earthquake in the united states?
the 1906 san francisco earthquake
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the harvard cmt project assigned it a focal depth of 647 km and a magnitude mw of 8.2, making it, at the time, the largest earthquake since the 1977 sumba earthquake, later superseded by more recent larger events (e.g., 2004 indian ocean earthquake). it is also the second largest earthquake ever recorded with a focal depth greater than 300 km, the largest currently being the 2013 okhotsk sea earthquake. south america also experienced the then second and third largest earthquakes at focal depths greater than 300 km: colombia, 1970; and northern peru, 1922.









































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1994 bolivia earthquake