Enhanced reflectivity of backthrusts in the recent great Sumatran earthquake rupture zones
Enhanced reflectivity of backthrusts in the recent great Sumatran earthquake rupture zones
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近期苏门答腊大地震破裂带反冲断层反射率增强
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
A. Chauhan
中科院分区：
文献类型：
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作者：
Satish C. Singh;N. Hananto;A. Chauhan
在过去的五年里，苏门答腊岛俯冲带发生了三次大型逆冲地震，该地区的一部分仍然处于锁定状态。我们在苏门答腊西南边缘进行了深部地震反射调查，并在深度为15-20公里的四条剖面上对逆冲断层进行了成像。研究发现，2004年和2007年大地震破裂带逆冲断层的地震图像比俯冲带仍处于闭锁状态的区域更亮。我们认为这种增强的反射率是由于在大地震期间或之后不久沿重新激活的逆冲断层流体含量增加所致。如果这一解释是正确的，那么在弧前盆地中观测到的逆冲可以用来监测苏门答腊锁定带即将发生的大地震前后地幔楔的流体运动和地震前兆。
In the last five years, there have been three great megathrust earthquakes in the Sumatra subduction zone, and a part of the zone is still locked. We have carried out deep seismic reflection surveys along the SW Sumatran margin and have imaged backthrusts along four profiles down to 15–20 km depth. We find that the seismic images of the backthrusts in the 2004 and 2007 great earthquake ruptured zones are brighter than those in the regions where the subduction zone is still locked. We suggest that this enhanced reflectivity is due to the increase of fluid contents along the reactivated backthrusts during or soon after the great earthquakes. If this interpretation is valid, then the backthrusts observed in the forearc basins could be used to monitor fluid movement from mantle wedge and earthquake precursors before and after an imminent great earthquake in the Sumatra locked zone.
2009 年 9 月巴东地震
影响因子：
18.3
作者：
McCloskey J
通讯作者：
McCloskey J