Earthquake swarm
Earthquake swarms are events where a local area experiences sequences of many earthquakes striking in a relatively short period of time. The length of time used to define the swarm itself varies, but the United States Geological Survey points out that an event may be on the order of days, weeks, or months.[1] They are differentiated from earthquakes succeeded by a series of aftershocks by the observation that no single earthquake in the sequence is obviously the main shock. Earthquake swarms are one of the events typically preceding eruptions of volcanoes.
One example is along the Cerro Prieto fault near Mexicali, BC in Mexico where over 500 quakes and aftershocks hit in February, 2008.[2] Another is a swarm that's been dubbed "The Mogul earthquake sequence" that began in February 2008 near Reno, Nevada and continued for several months, ending in November 2008.[3] Between February and April the swarm produced more than 1,000 quakes of small magnitude, although the largest measured 4.7.
See also
References
- ^ "Earthquake Swarms at Yellowstone". United States Geological Survey. Retrieved 2008-08-27.
{{cite web}}: Italic or bold markup not allowed in:|publisher=(help) - ^ Sandra Dibble. "Ground stays still, but residents in quake area rattled". The San Diego Union-Tribune. Retrieved 2008-08-27.
{{cite web}}: Italic or bold markup not allowed in:|publisher=(help) - ^ Ashley Powers. "Swarm of earthquakes shakes Reno area". Los Angeles Times. Retrieved 2008-08-27.
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