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首页> 外文期刊>Journal of Asian earth sciences >Recurrence of large paleo-earthquakes in Kashmir Himalaya seismic gap (Riasi area, India)
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Recurrence of large paleo-earthquakes in Kashmir Himalaya seismic gap (Riasi area, India)

机译：Kashmir Himalaya地震差距中大古地震的再次发生（印度Riasi地区）

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摘要

In Kashmir Himalaya, the Medlicott-Wadia Thrust is a main active fault responsible for the crustal accretionary prism building during the Late Quaternary. Because of the long seismic silence during the last five centuries, it is a key structure to be studied in order to estimate the regional seismic hazard. In the Riasi area, the analysis of two paleoseismological trenches allowed us identifying and measuring several seismic ruptures over the last similar to 3500 years. We determined that the oldest rupture occurred around 1600-1000 BC, while the youngest occurred after 1470 AD. The latest event is compatible with the great 1555 AD (Mw 7.5) Kashmir earthquake, whose evidence at the surface had not yet been recognized. Our results show that despite the long-lasting seismic gap, the Medlicott-Wadia Thrust is a main seismogenic structure in the region, able to produce large earthquakes. Their recurrence interval ranges between 500 and 700 years, implying that a main seismic event could occur in the next decades. These seismic ruptures are localized over gently-dipping fault branches associated with decameter-scale scarps. The morphologies observed are due to a significant non-localized component of the deformation in Quaternary sediments.
机译：在Kashmir Himalaya，Medlicott-Wadia Thrust是一个主要的积极故障，负责在第四纪后期的地壳增生棱镜建筑负责。由于在过去五世纪的沉默沉默，因此是要研究的关键结构，以估计区域地震危害。在Riasi地区，对两种古摆沟的分析允许美国识别和测量近期类似于3500年的地震破裂。我们确定最古老的破裂发生在1600-1000英镑，而1470年之后最年轻的发生。最新事件与大1555年（MW> 7.5）克什米尔地震兼容，其表面的证据尚未得到认可。我们的研究结果表明，尽管持久的地震差距持久，所以Medlicott-Wadia推力是该地区的主要地震结构，能够生产大地震。他们的复发间隔范围在500到700年之间，这意味着在未来几十年中可能会发生主要地震事件。这些地震破裂是用抑制尺寸围轴相关的轻微浸渍的断裂分支局部化。观察到的形态是由于季沉积物中变形的显着非局部化组分。

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