Earthquake swarm
| Part of a series on earthquakes |
|---|
| Types |
| Foreshock • Aftershock • Blind thrust Doublet • Interplate • Intraplate Megathrust • Remotely triggered • Slow Submarine • Supershear Tsunami • Earthquake swarm |
| Causes |
| Fault movement • Volcanism • Induced seismicity |
| Characteristics |
| Epicenter • Hypocenter • Shadow zone Seismic wave • P-wave • S-wave |
| Measurement |
| Seismic scales • Seismometer Earthquake duration magnitude |
| Prediction |
| Coordinating Committee for Earthquake Prediction Earthquake sensitive |
| Other |
| Shear wave splitting • Adams–Williamson equation Flinn-Engdahl regions • Earthquake engineering Seismite • Seismology |
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 was the so-called "Mogul earthquake sequence" that began in February 2008 near Reno, Nevada and continued for several months, ending in November 2008.[2] Between February and April the swarm produced more than 1,000 quakes of small magnitude, although the largest measured 4.7. Another example was that affecting the island of El Hierro. From July 2011 until October 2011, hundreds of small earthquakes were measured. The accumulated energy released by the swarm increased dramatically on 28 September.[3] The swarm was due to the movement of magma beneath the island, and on 9 October indications of a submarine volcanic eruption were detected.[4]
[edit] See also
- Blanco Fracture Zone
- Earthquake storm
- Gutenberg–Richter law
- Remotely triggered earthquakes
- Seismology
[edit] References
- ^ "Earthquake Swarms at Yellowstone". United States Geological Survey. http://volcanoes.usgs.gov/yvo/2004/Apr04Swarm.html. Retrieved 2008-08-27.
- ^ Ashley Powers; Thomas H. Maugh II. "Swarm of earthquakes shakes Reno area". Los Angeles Times. http://www.azcentral.com/news/articles/2008/04/30/20080430renoquakes0430-ON.html. Retrieved 2008-08-27.
- ^ http://www.02.ign.es/ign/resources/volcanologia/html/energiaHierro.html
- ^ http://www.elpais.com/articulo/sociedad/Instituto/Geografico/Nacional/apunta/erupcion/submarina/marcha/Hierro/elpepusoc/20111010elpepusoc_5/Tes
 |
This article about an earthquake is a stub. You can help Wikipedia by expanding it. |
