【自然灾害15-05-18】喜马拉雅地区理论上是否能发生Mw~9大地震？【台风吧】

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【自然灾害15-05-18】喜马拉雅地区理论上是否能发生Mw~9大地震？

by H. K. Gupta and V. K. Gahalaut
最近尼泊尔的Mw7.8(USGS)，面波震级~8.1(中国地震局)。很早以前就已经提出了地球上所有俯冲板块是能够产生Mw~9地震。喜马拉雅碰撞弧也在内。我们研究了喜马拉雅地区最近和历史上的大地震，表明在过去几百年中，只有Mw~8大型地震发生在这个区域，最大的地震属于1950年的Assam地震Mw8.6。有多个无震岭(又叫无震海岭, aseismic ridges)在喜马拉雅碰撞弧，并且这些无震岭似乎限制了过去200年的地震破裂程度。这里还有分散变形和反序型逆冲地震(汶川属于反序型逆冲地震)，只有很少一部分的地震成因是涉及到板块汇聚。我们的结论是喜马拉雅地区不太可能发生Mw~9地震。

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来自iPhone客户端1楼2015-05-18 00:49回复

原文
Can an earthquake of Mw∼9 occur in the Himalayan region?
It has been suggested that all of the Earth's subduction zones are capable of producing an Mw∼9 earthquake. Such a possibility has also been suggested for the Himalayan collisional arc. We examined recent and historical earthquakes in the Himalayan region and suggest that, in the past few hundred years, only great earthquakes (Mw∼8) have occurred in the region, the largest being the 1950 Assam earthquake with Mw 8.6. Several aseismic ridges segment the Himalayan arc and these appear to have limited the extent of rupture in earthquakes of the past 200 years. There is also evidence of distributed deformation and out-of-sequence thrusting, where only part of the detachment participates in the accommodation of the convergence. We concluded that, although it is unlikely that an Mw∼9 earthquake could occur in the Himalaya

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来自iPhone客户端2楼2015-05-18 00:51

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