The aftershock distribution of the 2014 Mw 8.1 Iquique earthquake offshore northern Chile, identified from a long‐term deployment of ocean bottom seismometers installed eight months after the mainshock, in conjunction with seismic reflection imaging, provides insights into the processes regulating the updip limit of coseismic rupture propagation. Aftershocks updip of the mainshock hypocenter frequently occur in the upper plate and are associated with normal faults identified from seismic reflection data. We propose that aftershock seismicity near the plate boundary documents subduction erosion that removes mass from the base of the wedge and results in normal faulting in the upper plate. The combination of very little or no sediment accretion and subduction erosion over millions of years has resulted in a very weak and aseismic frontal wedge. Our observations thus link the shallow subduction zone seismicity to subduction erosion processes that control the evolution of the overriding plate.

中文翻译：

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俯冲侵蚀与2014 Mw 8.1伊基克地震的上倾极限之间的关系

智利北部近海2014年Mw 8.1 Iquique地震的余震分布，是根据在地震主震后八个月安装的海底地震仪的长期部署确定的，结合地震反射成像，提供了对调节同震上升极限的过程的见解。破裂传播。主震震源的余震上倾经常发生在上板中，并与从地震反射数据中识别出的正常断层有关。我们认为，板块边界附近的余震地震记录了俯冲侵蚀作用，这种侵蚀作用使楔形基体的质量消失，并导致上板块的正常断裂。数百万年以来，很少或没有沉积物积聚和俯冲侵蚀相结合，导致锋面楔形物非常弱且抗震。