Friday, December 14, 2012

West Coast Earthquake Swarm - Information Only - 14.12.2012

WEST COAST ALERT!!!
Earthquake Swarm Currently in Progress!!! 
4 EQs in 2 1/2 min, 2 6+ Mag Cali.. 2 3+ Mag Utah. 
Stay Alert!!!!!
 

Earthquake Index Map

 

Significant Earthquakes Past 30 Days

  1. M 6.1, 142km SW of Avalon, California Friday, December 14, 2012 10:36:18 UTC
  2. M 6.4, 262km SSW of Avalon, California Friday, December 14, 2012 10:36:01 UTC
  3. M 7.1, 227km NW of Saumlaki, Indonesia Monday, December 10, 2012 16:53:09 UTC
  4. M 6.3, 21km ESE of Tokoroa, New Zealand Friday, December 07, 2012 18:19:07 UTC
  5. M 7.3, 245km SE of Kamaishi, Japan Friday, December 07, 2012 08:18:24 UTC
  6. M 5.8, 43km SE of Qayen, Iran Wednesday, December 05, 2012 17:08:12 UTC
  7. M 5.8, 44km W of Anchorage, Alaska Tuesday, December 04, 2012 01:42:48 UTC

M6.1 - 142km SW of Avalon, California 2012-12-14 10:36:18 UTC

Summary

Location and Magnitude contributed by: California Integrated Seismic Network

General

50 km
20 mi
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32.414°N, 119.372°W
Depth: 11.1km (6.9mi)

Event Time

  1. 2012-12-14 10:36:18 UTC
  2. 2012-12-14 02:36:18 UTC-08:00 at epicenter
  3. 2012-12-14 04:36:18 UTC-06:00 system time

Location

32.413°N 119.372°W depth=11.1km (6.9mi)

Nearby Cities

  1. 142km (88mi) SW of Avalon, California
  2. 173km (107mi) SSW of Rancho Palos Verdes, California
  3. 177km (110mi) SW of San Pedro, California
  4. 179km (111mi) SSW of Palos Verdes Estates, California
  5. 691km (429mi) W of Phoenix, Arizona

M6.4 - 262km SSW of Avalon, California 2012-12-14 10:36:01 UTC

Summary

Location and Magnitude contributed by: USGS, NEIC, Golden, Colorado (and predecessors)

General

200 km
200 mi
Powered by Leaflet
31.219°N, 119.551°W
Depth: 10.1km (6.3mi)

Event Time

  1. 2012-12-14 10:36:01 UTC
  2. 2012-12-14 02:36:01 UTC-08:00 at epicenter
  3. 2012-12-14 04:36:01 UTC-06:00 system time

Location

31.219°N 119.551°W depth=10.1km (6.3mi)

Nearby Cities

  1. 262km (163mi) SSW of Avalon, California
  2. 268km (167mi) WSW of Rosarito, Mexico
  3. 275km (171mi) WSW of Imperial Beach, California
  4. 276km (171mi) SW of Coronado, California
  5. 745km (463mi) WSW of Phoenix, Arizona

Tectonic Summary

Seismotectonics of Mexico

Located atop three of the large tectonic plates, Mexico is one of the world's most seismologically active regions. The relative motion of these crustal plates causes frequent earthquakes and occasional volcanic eruptions. Most of the Mexican landmass is on the westward moving North American plate. The Pacific Ocean floor south of Mexico is being carried northeastward by the underlying Cocos plate. Because oceanic crust is relatively dense, when the Pacific Ocean floor encounters the lighter continental crust of the Mexican landmass, the ocean floor is subducted beneath the North American plate creating the deep Middle American trench along Mexico's southern coast. Also as a result of this convergence, the westward moving Mexico landmass is slowed and crumpled creating the mountain ranges of southern Mexico and earthquakes near Mexico's southern coast. As the oceanic crust is pulled downward, it melts; the molten material is then forced upward through weaknesses in the overlying continental crust. This process has created a region of volcanoes across south-central Mexico known as the Cordillera Neovolcánica.
The area west of the Gulf of California, including Mexico's Baja California Peninsula, is moving northwestward with the Pacific plate at about 50 mm per year. Here, the Pacific and North American plates grind past each other creating strike-slip faulting, the southern extension of California's San Andreas fault. In the past, this relative plate motion pulled Baja California away from the coast forming the Gulf of California and is the cause of earthquakes in the Gulf of California region today.
Mexico has a long history of destructive earthquakes and volcanic eruptions. In September 1985, a magnitude 8.1 earthquake killed more than 9,500 people in Mexico City. In southern Mexico, Volcán de Colima and El Chichón erupted in 2005 and 1982, respectively. Paricutín volcano, west of Mexico City, began venting smoke in a cornfield in 1943; a decade later this new volcano had grown to a height of 424 meters. Popocatépetl and Ixtaccíhuatl volcanos ("smoking mountain" and "white lady", respectively), southeast of Mexico City, occasionally vent gas that can be clearly seen from the City, a reminder that volcanic activity is ongoing. In 1994 and 2000 Popocatépetl renewed its activity forcing the evacuation of nearby towns, causing seismologists and government officials to be concerned about the effect a large-scale eruption might have on the heavily populated region. Popocatépetl volcano last erupted in 2010.
More information on regional seismicity and tectonics