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Archive for the ‘Eureka’ Category

M6.9 Quake Strikes West of Eureka, California

Posted by feww on March 10, 2014

SEISMIC HAZARD
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Strong Earthquake Strikes 81km West Of Eureka, California

Magnitude 6.9 earthquake struck offshore 81km west of Eureka, California (population: 27,000) at 2014-03-10 05:18UTC.

The quake was preceded by at least 3 foreshocks and followed by 10 aftershocks, with the largest  measuring 4.6Mw, as of posting.

Earthquake Location Map

Eureka quake 9-3-14
Approximate location of the Eureka quake, fore- and aftershocks, as of 07:10UTC March 10, 2014.  Source: USGS/EHP

Earthquake Details

Event Time: 2014-03-10 05:18:12 UTC
Location: 40.821°N, 125.128°W depth=7.0km (4.3mi)
Nearby Cities:

  • 77km (48mi) WNW of Ferndale, California
  • 81km (50mi) W of Eureka, California
  • 85km (53mi) WNW of Fortuna, California
  • 87km (54mi) W of McKinleyville, California
  • 398km (247mi) NW of Sacramento, California
  • Source: USGS/EHP

TSUNAMI EVALUATION
NO Tsunami threat to ALASKA/ BRITISH COLUMBIA/ WASHINGTON/ OREGON AND CALIFORNIA

A WIDESPREAD DESTRUCTIVE TSUNAMI THREAT DOES NOT EXIST BASED ON HISTORICAL EARTHQUAKE AND TSUNAMI DATA.

THE U.S. NATIONAL TSUNAMI WARNING CENTER WILL ISSUE INFORMATION REGARDING ANY LOCAL TSUNAMI THREAT TO COASTS NEAR THE EARTHQUAKE EPICENTER.

Other Significant Quake(s)

M5.8 – 37km SW of Santiago Pinotepa Nacional, Mexico
Event Time: 2014-03-10 00:38:15 UTC
Location: 16.080°N,98.267°W; depth=10.0km (6.2mi)
Nearby Cities:

  • 37km (23mi) SW of Santiago Pinotepa Nacional, Mexico
  • 68km (42mi) SSE of Ometepec, Mexico
  • 131km (81mi) WNW of Puerto Escondido, Mexico
  • 140km (87mi) SE of San Marcos, Mexico
  • 381km (237mi) SSE of Mexico City, Mexico

Related Links and Recent U.S. Quakes

Posted in earthquake, Earthquake Hazard, earthquake report, Eureka, Eureka quake | Tagged: , , , , , , | Leave a Comment »

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:

Posted in Bayview, Calif quake 2010, earthquake forecast, Eureka, Ferndale quake | Tagged: , , , , , , , | 4 Comments »