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Strong Quake Strikes Offshore N California

Posted by feww on January 10, 2010

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.

Closeup View closeview Event Location earthview Alert Status wwareas


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.

Related Links:

4 Responses to “Strong Quake Strikes Offshore N California”

  1. […] Strong Quake Strikes Offshore N California Volcanoes Earthquakes FEWW Volcano Links California Earthquake Forecast – Update 3 […]

  2. George said

    This quake was not in the location of your forecast.
    How does it affect your forecast?

  3. AK said

    I live in Brookings Oregon, on the coast, five miles north of the California border. I felt the repercussion of the quake at 4:30 p.m., Saturday 1/09/10. The swaying lasted for several seconds. I’ve lived in Brookings since August, 2009. I have felt minor quakes about once/month, nothing quite as strong as this quake.

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