Notable Earthquake of the Week

Irvin-Tehachapi, California, M7.7 Earthquake  

On July 21, 1952, at 3:52 a.m., a very strong earthquake occurred southeast of Bakersfield, California. The Arvin-Tehachapi (aka. Kern County) earthquake measured Ms 7.7 (Mw 7.3) and vigorously shook the region, registering Modified Mercalli intensity scale ratings of X-XI, a relative shaking intensity scale from 1-12 shown in Roman numerals, indicating near total destruction close to the epicenter.

The quake occurred along the northeast trending White Wolf Fault and was associated with extensive surface ruptures near Bear Mountain. Many aftershocks, including two in the M6 range (M6.3, July 21; M6.3, July 29), contributed to the widespread damage that exceeded $70 million. Fourteen people were killed and at least 53 were seriously injured.


See the poster-sized map of Southern California Earthquakes here.


Seismo-Watch Earthquake Reports

Track weekly earthquake activity with the Seismo-Watch Earthquake Reports. Click here or on any of the reports below.

You can also track activity in Central California with the Brief CCA Earthquake Report, the Western Basin and Range, including the very active Mammoth Lakes region, with the Brief WGB Earthquake Report, and in Southern California with the Coachella Valley Earthquake Report.

Seismo-Watch Alert Bulletins are a great way to be informed right away when significant earthquakes occurs.