Magnitude 6.5 [Possibly 6.7Mw] Strikes Offshore Northern California
Strong earthquake measuring up to 6.7Mw struck offshore northern California Sunday, January 10, 2010 at 00:27:39 UTC.
The quake was located at 40.674°N, 124.655°W about 35 km (22 miles) WNW (288°) from Ferndale, and 39 km (24 miles) W (261°) from Humboldt Hill, CA, and occurred at a depth of 16.4 km (10.2 miles), USGS reported.
The Mainshock which occurred to the east of Cascadia Subduction Zone, was followed by at least 4 aftershocks, as of posting, the largest of which measured 3.8 to 4.1Mw.
Tsunami Information
According to NOAA’s West Coast and Alaska Tsunami Center website there was no Tsunami Watch, Warning, or advisory in effect. Click image to enlarge.
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Event Location |  |
Alert Status |  |
10-degree Map Centered at 40°N,125°W
Earthquake Location map. Source: USGS/EHP. Enhanced by FEWW. (Click Images to enlarge). All images are sourced from USGS/EHP
USGS Quaternary Fault and Fold Database for the United States: Eureka 1° x 2° Sheet
Earthquake Details
- Magnitude: 6.5 [FEWW Estimate: Mainshock may have measured up to 6.7Mw]
- Date-Time:
- Sunday, January 10, 2010 at 00:27:38 UTC
- Saturday, January 09, 2010 at 04:27:38 PM at epicenter
- Location: 40.645°N, 124.763°W
- Depth: 21.7 km (13.5 miles)
- Region: OFFSHORE NORTHERN CALIFORNIA
- Distances:
- 43 km (27 miles) W (280°) from Ferndale, CA
- 48 km (30 miles) W (259°) from Humboldt Hill, CA
- 51 km (32 miles) WSW (255°) from Bayview, CA
- 53 km (33 miles) WSW (252°) from Eureka, CA
- 365 km (227 miles) NW (310°) from Sacramento, CA
- Location Uncertainty: horizontal +/- 0.7 km (0.4 miles); depth +/- 1.6 km (1.0 miles)
- Parameters Nph= 56, Dmin=41 km, Rmss=0.24 sec, Gp=220°,
- M-type=regional moment magnitude (Mw), Version=8
- Source: California Integrated Seismic Net: USGS; Caltech; CGS; UCB; UCSD; UNR
- Event ID: nc71338066
Earthquake Location.
USGS Topographic Map, Resolution: 16.0 meters/pixel
Seismic Hazard Map
Estimated Population Exposed to Earthquake Shaking. Click images to enlarge.
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