Notable Earthquake of the Week
Santa Barbara, California M 7.0+ Earthquake
At about 11:00 a.m. December 21, 1812, a very strong M7.0+ earthquake struck the Santa Barbara- Ventura region, registering shaking intensities of X on the Modified Mercalli scale (a relative intensity rating from 1-12 shown in Roman numerals).
 
A strong foreshock of comparable magnitude occurred about 15 minutes earlier, alarming local residents and causing them to flee buildings. This undoubtedly saved many lives as many of the buildings and missions were wrecked by the earthquakes, including the Santa Ynez, Purisima, San Buenaventura and Santa Barbara Missions.
 
A vigorous aftershock sequence lasted for years and reports of a huge tsunami were exaggerated but there was probably some sort of sea wave. Liquefaction was widespread along the coastal regions, contributing to the damage.
 
Interestingly, a M 7.0+ quake occurred along the San Gabriel segment of the San Andreas Fault just 13 days earlier.


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