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首页> 外文期刊>Bulletin of the Seismological Society of America >Slow Slip Acceleration beneath Andaman Islands Triggered by the 11 April 2012 Indian Ocean Earthquakes
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Slow Slip Acceleration beneath Andaman Islands Triggered by the 11 April 2012 Indian Ocean Earthquakes

机译：2012年4月11日印度洋地震引发的安达曼群岛下方缓慢滑动加速

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摘要

The M_w 8.6 and 8.2 strike-slip earthquakes that struck the northeast Indian Ocean on 11 April 2012 resulted in coseismic deformation both at near and distant sites. The slip distribution, deduced using seismic-wave analysis for the orthogonal faults that ruptured during these earthquakes, is sufficient to predict the coseismic displacements at the Global Positioning System (GPS) sites, such as NTUS, PALK, and CUSV, but fall short at four continuous sites in the Andaman Islands region. Slip modeling, for times prior to the events, suggests that the lower portion of the thrust fault beneath the Andaman Islands has been slipping at least at the rate of 40 cm=yr, in response to the 2004 Sumatra-Andaman coseismic stress change. Modeling of GPS displacements suggests that the en echelon and orthogonal fault ruptures of the 2012 intraplate oceanic earthquakes could have possibly accelerated the ongoing slow slip, along the lower portion of the thrust fault beneath the islands with a month-long slip of 4-10 cm. The misfit to the coseismic GPS displacements along the Andaman Islands could be improved with a better source model, assuming that no local process contributed to this anomaly.
机译：2012年4月11日袭击印度洋东北部的M_w 8.6和8.2级走滑地震在附近和远处造成了同震变形。使用地震波分析得出的在地震中破裂的正交断层的滑动分布足以预测全球定位系统（GPS）站点（例如NTUS，PALK和CUSV）的同震位移，但在在安达曼群岛地区有四个连续的地点。在事件发生之前的时间里，滑移模型表明，响应于2004年苏门答腊-安达曼同震应力变化，安达曼群岛下方的逆冲断层下部至少以40 cm = yr的速度滑动。 GPS位移的模型表明，2012年板块内地震的梯级和正交断层破裂可能会加速持续的缓慢滑动，沿着岛屿下方的逆冲断层下部，为期一个月的滑动4-10 cm 。假设没有本地过程导致这种异常，则可以通过使用更好的源模型来改善沿安达曼群岛的同震GPS位移的失配。

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