M6.9 Quake Strikes West of Eureka, California

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

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

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• Significant Earthquakes Strike Oklahoma December 29, 2013
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• 41 Earthquakes Strike Oklahoma in November  December 1, 2013
• Earthquake No. 19 Strikes N. Texas November 29, 2013
• Two More Quakes Strike North Texas November 29, 2013
• Oil Drilling Likely Caused Texas Earthquake Posted on May 17, 2009
• M3.3 Quake Strikes Azle, Texas Posted on November 25, 2013
• FEWW Earthquake Links

Strong Earthquake Strikes Offshore N Calif

Earthquake measuring up to 6.1 Mw strikes offshore  northern California

Strong earthquake measuring up to 6.1Mw struck offshore northern California about 56 km (35 miles) WNW (282°) of Petrolia, CA, Thursday, February 4, 2010 at 20:20 UTC.

The earthquake was felt as far north as  Oregon’s Grant Passs, south to  San Francisco and east to Redding, reports said.

The quake occurred about 27km (17 miles) southwest of the M6.7 January 10 (UTC) quake that shook Ferndale and Humboldt Hill, CA.

Earthquake Location

Click image to enlarge. Source: NEIC/USGS

Tsunami Info

Although the quake struck at a depth of about 11 km, it wasn’t strong enough to create a significant tsunami.

Injury/Damage

Items reportedly fell from walls and shelves but there was no reports of serious damage, or any injuries as of posting.

The January 10 quake (UTC) caused at least $40 million in damage and a serious injury when an elderly woman broke her hip in a fall, Mercury News reported.

Earthquake Details:

• Magnitude as reported by USGS: 5.9 [Max magnitude estimated by Fire-Earth: 6.1Mw]
• Date-Time:
  • Thursday, February 04, 2010 at 20:20:21 UTC
  • Thursday, February 04, 2010 at 12:20:21 PM at epicenter
• Location: 40.431°N, 124.929°W
• Depth: 11.2 km (7.0 miles)
• Region: OFFSHORE NORTHERN CALIFORNIA
• Distances:
  • 56 km (35 miles) WNW (282°) from Petrolia, CA
  • 59 km (36 miles) WSW (254°) from Ferndale, CA
  • 68 km (42 miles) WSW (256°) from Fortuna, CA
  • 76 km (47 miles) WSW (239°) from Eureka, CA
  • 363 km (225 miles) NW (306°) from Sacramento, CA

• Location Uncertainty: horizontal +/- 1.4 km (0.9 miles); depth +/- 2 km (1.2 miles)
• Source:
  • California Integrated Seismic Net:
  • USGS Caltech CGS UCB UCSD UNR
• Event ID: nc71348851

Shakemap

Earthquake Shakemap. Source: CISN/USGS

Seismic hazard Map

Click image to enlarge.

USGS Quaternary Fault and Fold Database for the United States: Eureka 1° x 2° Sheet

Click image to enlarge.


Cascadia Subduction Zone

Cascadia Subduction Zone. Source: USGS

Quake Animations

• USA
• World

• California/Nevada

• San Francisco Bay Area
• Los Angeles Area
• Long Valley Area
• Parkfield Area

• Intermountain West

• Utah/Yellowstone
• Yellowstone National Park

Related Links:

• Strong Quake Strikes Offshore N California
  Volcanoes
  Earthquakes
  FEWW Volcano Links
  California Earthquake Forecast – Update 3