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November 29, 2008
Earthquake Swarm Near Trona, CA, M4.1, 17 Miles NNE of Trona, M3.0 14 Miles N of Trona on 11/30/08, and a M4.0 - 14 Miles North of Trona, CA on 11/29/08
Filed under: Felt Earthquakes, Large Events — Anthony Guarino @ 1:31 pm
There is an ongoing earthquake swarm near Trona CA. The most recent large event was a M3.1 earthquake, located 15 miles NNE of Trona at 2:38PM, preceded by a M3.0 earthquake, located 14 miles N of Trona at 5:11 AM, preceded by a M4.1 earthquake at 5:03AM, located 17 miles NNE of Trona, CA on 11/30/08. These events were all preceded by a M4.0 event that occurred yesterday, located 14 miles north of Trona, CA at 1:14PM. Both M4+ events were felt in the epicentral region, and may have been felt as far away as Lone Pine and Ft. Irwin. This swarm is common for CA, and may continue for hours to days.
Earthquake swarms are common in the Coso area, often producing hundreds of tremors over periods of time as short as a few days. This kind of brisk and robust seismic activity is common in volcanic areas, such as Long Valley Caldera located near Mammoth Lakes, and Yellowstone Caldera at Yellowstone. The Coso Volcanic Field shows stunning examples of volcanic activity, probably last active 30-40,000 years ago, but ash emission and small cone building episodes may be Holocene (>10,000 years) in age.
Magnitude 5.9
Date-Time
* Friday, November 28, 2008 at 13:42:18 UTC
* Friday, November 28, 2008 at 05:42:18 AM at epicenter
* Time of Earthquake in other Time Zones
Location 40.336°N, 126.981°W
Depth 10 km (6.2 miles) set by location program
Region OFF THE COAST OF NORTHERN CALIFORNIA
Distances
* 229 km (142 miles) W (271°) from Petrolia, CA
* 232 km (144 miles) W (264°) from Ferndale, CA
* 239 km (148 miles) W (260°) from Humboldt Hill, CA
* 243 km (151 miles) W (259°) from Eureka, CA
* 486 km (302 miles) NW (307°) from San Francisco City Hall, CA
Location Uncertainty horizontal +/- 5.6 km (3.5 miles); depth fixed by location program
Parameters NST= 88, Nph= 88, Dmin=282.3 km, Rmss=1.03 sec, Gp=122°,
M-type=regional moment magnitude (Mw), Version=9
Source
* USGS NEIC (WDCS-D)
Event ID us2008zya2
Magnitude 4.0 - OFF THE COAST OF WASHINGTON
2008 November 29 01:13:19 UTC
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Earthquake Details
Magnitude 4.0
Date-Time
* Saturday, November 29, 2008 at 01:13:19 UTC
* Friday, November 28, 2008 at 04:13:19 PM at epicenter
* Time of Earthquake in other Time Zones
Location 47.528°N, 128.887°W
Depth 10 km (6.2 miles) set by location program
Region OFF THE COAST OF WASHINGTON
Distances
* 331 km (206 miles) WSW (255°) from Neah Bay, WA
* 340 km (211 miles) W (264°) from Forks, WA
* 346 km (215 miles) W (275°) from Taholah, WA
* 423 km (263 miles) WSW (257°) from Saanich, British Columbia, Canada
* 467 km (290 miles) WSW (248°) from Vancouver, British Columbia, Canada
Location Uncertainty horizontal +/- 16 km (9.9 miles); depth fixed by location program
Parameters NST= 49, Nph= 49, Dmin=298.7 km, Rmss=1.2 sec, Gp=216°,
M-type=body magnitude (Mb), Version=Q
Source
* USGS NEIC (WDCS-D)
Event ID us2008zzad
* This event has been reviewed by a seismologist.
(Note by JustMike: I now skip some general info about related organizations and go to the last lines of this page.)
U.S. Department of the Interior | U.S. Geological Survey
URL: earthquake.usgs.gov...
Page Contact Information: EHP Web Team
Page Last Modified: December 03, 2008 03:49:23 UTC