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Posts Tagged ‘cascadia subduction zone’

Seismic Cluster Strikes Offshore Oregon

Posted by feww on May 8, 2010

Larger Shocks May Occur

Cluster of at least 9 shocks strike offshore Oregon

Earthquake measuring about 5.4Mw struck the offshore Oregon about 500km west of Eugene on Friday, May 07, 2010 at 17:46:15UTC.

Epicenter of the earthquake was located near 44.396°N, 129.437°W and occurred at a depth of  10 km (6.2 miles). The initial shock was followed by at least 8 other events [aftershocks] measuring a mean magnitude of about 4.4Mw.

Center of the cluster was about 1,000km (600 miles) south of  a magnitude 8.1 shock that occurred on the Queen Charlotte Fault off Queen Charlotte Island on August 22, 1949. That event was Canada’s largest earthquake since 1700.

10-degree Map Centered at 45°N,130°W


Earthquake Location Map. Source: USGS/EHP. Map enhanced by Fire-Earth.

Earthquake Details

  • Magnitude [USGS Estimate]: 5.1 [Fire Earth Estimate: 5.4, or greater]
  • Date-Time:
    • Friday, May 07, 2010 at 17:46:15 UTC
    • Friday, May 07, 2010 at 08:46:15 AM at epicenter
  • Location: 44.396°N, 129.437°W
  • Depth: 10 km (6.2 miles)
  • Region: OFF THE COAST OF OREGON
  • Distances:
    • 424 km (263 miles) W (273°) from Yachats, OR
    • 427 km (265 miles) W (271°) from Waldport, OR
    • 427 km (265 miles) WNW (288°) from Barview, OR
    • 505 km (314 miles) W (276°) from Eugene, OR
    • 549 km (341 miles) W (259°) from Portland, OR
  • Location Uncertainty: horizontal +/- 6 km (3.7 miles)
  • Source: USGS NEIC (WDCS-D)
  • Event ID: us2010vzbx


Cascadia Subduction Zone


Cascadia Subduction Zone. Source: USGS

Related Links:

[* Reference Only. Research suspended see: Calif Earthquake Forecast – Update 4]

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Posted in earhquake forecast, earthquake, earthquake 2010, Earthquake cluster, environment | Tagged: , , , | Leave a Comment »

Strong Earthquake Strikes Offshore N Calif

Posted by feww on February 5, 2010

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

Related Links:

Posted in calif seismicity, earthquake, Eureka quake, petrolia quake, seismic event report | Tagged: , , , , , , | Leave a Comment »