Special Reports
Regional Location:

Preliminary Magnitude:

Greenwich Mean Date:
Greenwich Mean Time:
Focal Depth:


M 4.3 (NCSN), Mw 4.4 UCB

2.5 km (1.6 miles)

Moderate M 4.4 earthquake strikes the California North Coast

Seismo-Watch More Special Earthquake Reports

Tuesday, January 7, 2003

An earthquake registering M 4.4 occurred this evening along the California North Coast off shore seismic zones. Early reports indicate it was widely felt in coastal Humboldt County, but there have been no reports damage or injuries at this time.

Seismo-Watch EQ Flash! Alert Bulletins notified subscribers of this earthquake within minutes after it happened. You should subscribe to the service too! It's FREE and Quick! NOW! Wireless EQ Flash! via pager, cell phone or PDA's! More info.

According to the Northern California Seismic Network (NCSN) the earthquake measured M 4.4 occurred at 05:43:41 GMT, January 8 (or 9:43 p.m. PST, January 7), about 71 miles southwest of Eureka and about 61 miles west of Petrolia in the Pacific Ocean. See US Geological Survey location map.

The focal depth was shallow, only 2.5 km beneath the surface. UC Berkeley determined a Moment magnitude (Mw) of 4.4 and their fault plane solution suggested strike-slip motion along an east-west trending plane. See solution.

The earthquake triggered along the Mendocino Fault, the southern boundary of the Gorda and Pacific tectonic plates.

Continued on Page 2

Report update: 1:22:23 PM, Wednesday, January 8, 2003

About Us || Terms of Use || Contact Us || Jobs || Advertise
©2003 Seismo-Watch, Inc. All rights reserved.