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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seismicity variations associated with aseismic transients in Guerrero, Mexico, 1995-2006
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Seismicity variations associated with aseismic transients in Guerrero, Mexico, 1995-2006

机译：1995-2006年，墨西哥格雷罗州，与地震瞬变有关的地震变化

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Primarily aseismic deformation transients in subduction zones, sometimes associated with tremors and low-frequency earthquakes, are a newly recognized mode of deformation. Stressing in the up-dip seismogenic zone is increased episodically due to down-dip transient slips, and each event may make it more prone to failure in a large thrust earthquake. It is important for seismic hazard assessment to search and identify patterns of seismicity variation associated with transients. The Guerrero, Mexico, region is chosen for this study because of long-term continuous geodetic observations and abundant seismicity in the shallow subduction zone. We search the GCMT and NEIC catalogs for earthquakes with depths less than 100 km between 1995 and 2006 within the area coveting the region affected by major transients since 1996. A completeness magnitude of M-c=4.5 is determined for the NEIC catalog used in this study, based on the maximum likelihood method. Three large transients in 1998, 2001-2002 and 2006 are all temporally correlated with high seismic rates in the studied area. In particular, transients are either preceded by a cluster of extensional earthquakes relatively far inland from the trench, or followed by shallow thrust earthquakes close to the trench. In some cases, such as the 2001-2002 transient, both types of activity are found bordering the transient. The assembled evidence suggests that transients may serve as a mechanism of stress communication between distant seismicity clusters in shallow subduction zones. (C) 2007 Elsevier B.V. All rights reserved.
机译：在俯冲带中，主要是地震变形瞬态，有时与地震和低频地震有关，是一种新近认识到的变形模式。由于下倾瞬态滑动，上倾发震带的应力会明显增加，并且每次地震都可能使其在大推力地震中更容易发生破坏。对于地震危险性评估而言，搜索和识别与瞬变有关的地震活动性变化模式非常重要。由于长期连续的大地观测和浅层俯冲带的丰富地震活动，选择了墨西哥的格雷罗地区进行此项研究。我们搜索了GCMT和NEIC目录，以查找1995年至2006年以来令人垂涎的，受自1996年以来受主要瞬变影响的区域内深度小于100 km的地震。对于本研究中使用的NEIC目录，Mc = 4.5的完整性震级被确定，基于最大似然法在研究区域，1998、2001-2002和2006年的三个大瞬变都与高地震发生率在时间上相关。尤其是，在瞬变之前，或者是距离沟槽相对内陆较远的一连串的延伸地震，或者是靠近沟槽的浅冲断地震。在某些情况下，例如2001-2002年瞬态，发现两种类型的活动都与瞬态接壤。汇总的证据表明，瞬变可能是浅俯冲带中远距离地震活动簇之间应力传递的一种机制。 （C）2007 Elsevier B.V.保留所有权利。

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