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首页> 外文期刊>Earth, planets and space: EPS >Is the Ryukyu subduction zone in Japan coupled or decoupled? —The necessity of seafloor crustal deformation observation
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Is the Ryukyu subduction zone in Japan coupled or decoupled? —The necessity of seafloor crustal deformation observation

机译：日本的琉球俯冲带是耦合的还是分离的？ —海底地壳变形观测的必要性

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摘要

The 2004 Sumatra-Andaman earthquake of Mw 9.3 occurred in a region where a giant earthquake seemed unlikely from the point of view of tectonics. This clearly implies that our current understanding of strain accumulation processes of large earthquakes at subduction zones needs to be reexamined. The Ryukyu subduction zone is one such zone since no large earthquake has been anticipated there for reasons similar those pertaining to the Sumatra-Andaman arc. Based on our analysis of historical earthquakes, plate motion, back-arc spreading, and GPS observation along the Ryukyu trench, we highly recommend monitoring seafloor crustal deformation along this trench to clarify whether a large earthquake (Mw > 8) could potentially occur there in the future.
机译：从构造学的角度看，2004年的苏门答腊安达曼9.3级地震发生在一个不太可能发生大地震的地区。这显然意味着，我们目前对俯冲带大地震应变累积过程的理解需要重新审查。琉球俯冲带就是这样的一个带，因为由于类似苏门答腊-安达曼弧线的原因，没有预料到会发生大地震。根据我们对历史地震，板块运动，弧后扩展和沿琉球海沟的GPS观测的分析，我们强烈建议监测沿该海沟的海底地壳变形，以弄清该地区是否可能发生大地震（Mw> 8）。未来。

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