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标题：Earthquake swarms in Greenland
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作者：Tine B. Larsen ; Peter H. Voss ; Trine Dahl Jensen 等
期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2014
卷号：31
页码：75-78
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Two earthquake swarms have been detected in Greenland.One occurred on the island of Disko in August 2010, theother one was active from January 2008 to June 2009 nearthe South-East Greenland coast c. 200 km south of Tasiilaq.An earthquake swarm is defned as a series of earthquakesof similar magnitude located within a small area. Te magnitude of the largest earthquakes in a swarm is typically lessthan 4 (Ma & Eaton 2009). Swarm activity is distinctly different from the more common mainshock–afershock activity, which is characterised by one large earthquake (mainshock) followed by a series of smaller afershocks. Earthquakeswarms mainly occur in areas with tectonic and/or volcanicactivity (Stykes 1970), but intraplate swarms are also foundin otherwise stable environments (Gregersen 1979; Atakanet al. 1994; Uski et al. 2006; Ma & Eaton 2009). Geologicalboundaries and old fault zones appear to be a common setting for intraplate earthquake swarms. Earthquake swarmshave previously been detected in North and North-EastGreenland (Gregersen 1979) at a time when the seismographcoverage was very sparse. It was concluded that the earthquake swarms were caused by tectonic stresses in and aroundold sedimentary basins near the continental margin.