Notable Earthquake of the Week
Point Arguello, (Lompoc), California M 7.3 Earthquake

At 5:50 a.m., November 4, 1927, a powerful earthquake measuring M 7.3 occurred in the Pacific Ocean about 7 miles west of Point Sal or 21 miles west-southwest of Santa Maria.

Shaking was very strong in several coast towns, registering Modified Mercalli intensity scale ratings as high as VIII (a relative shaking intensity scale from 1-12 shown in Roman numerals).
Buildings in Arroyo Grande, Berros, Guadalupe, Halcyon, Lompoc, Los Alamos, Nipomo, and Santa Maria sustained heavy damage, including collapsed walls and ceilings. Chimneys were thrown down throughout the region, cracked walls were common, and some homes were shifted from their foundations.
 
Liquefaction features, such as slumped ground and sand boils, were common along the water's edge, and landslides occurred throughout the south-central California Coast Range. A tsunami was observed on tide gauges from San Francisco to San Diego, with maximum wave heights of 1.8 meters (6 feet) at Surf and Port San Luis.
 
An extensive aftershock sequence persisted for years and contributed to the damage.


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