Special Reports
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Mb 4.7 (NCSN) Mw 5.1 (UCBSL)

10.0 km (Fixed)

Moderate M5.1 earthquake occurs off Northern California Coast

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November 30, 2001

An earthquake registering a magnitude Mb 4.5 (NCSN), Mw 5.1 (UCBSL) occurred late last night off the Northern California coast, but was too weak and too far away to cause and damage or injuries.

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According to the Northern California Seismic Network (NCSN) the earthquake occurred at 7:47 GMT November 30 or 11:46 p.m., November 29, about 145 miles west of Eureka and 165 miles west-southwest of Crescent City along the western segment of the Mendocino Fault, near the Gorda Ridge. See USGS map location.

There have been no reports of the quake being felt and it is unlikey considering how far away it was centered.

Earthquake activity off the Northern California coast has been rather light this year. This was the first earthquake registering M4.0 or stronger since a M4.7 in the Gorda plate on September 20 (See Seismo-Watch Report) and the largest since a M5.2 on January 11.

Report update: 10:25:15 AM, Friday, November 30, 2001

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