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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan
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Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan

机译：板界面结构和孔隙压力对日本南开俯冲区构造震颤的影响

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摘要

Episodes of tectonic tremor are observed in the Nankai accretionary prism close to the trough axis; however, their non-impulsive signals and the distortion of seismic signals in the accretionary prism make it challenging to accurately estimate their locations. Reliable tremor locations would help to characterize geological conditions favourable for tremor generation and could offer insights into the up-dip limit of coseismic ruptures. Here we report a new approach to pinpoint tremor locations based on seismic phase polarization. The estimated epicentres of tremor distribution mostly coincide with low-velocity shear zone or thick underthrust sediments where high pore pressures are inferred, and the distribution of tremor appears to be controlled by characteristics of the shear zone. A tremor episode occurred a couple days after the off-Mie earthquake clearly shows migration at a velocity similar to that of very low frequency earthquakes. Migration of tremor initiated around the outer ridge where the estimated pore pressure is greatest. The spatio-temporal tremor distribution indicates that pore pressure relaxation could trigger the tremor migration. The occurrence of tremor thus may indicate a weak shallow plate interface that is prone to slip following large earthquakes. Based on the information of tremor migration, the permeability along the fault can be estimated as 3.7 x 10(-12) m(2). (C) 2021 The Author(s). Published by Elsevier B.V.
机译：在靠近海槽轴的南开增生棱柱中观察到构造地震幕；然而，它们的非脉冲信号以及吸积棱镜中地震信号的失真使得精确估计它们的位置变得非常困难。可靠的地震位置将有助于描述有利于地震产生的地质条件，并可为同震破裂的上倾极限提供见解。在这里，我们报告了一种基于地震相位极化精确定位地震位置的新方法。地震分布的估计震中大多与低速剪切带或推断出高孔隙压力的厚逆冲沉积物一致，地震分布似乎受剪切带特征控制。离米地震几天后发生的一次地震事件清楚地表明，迁移的速度与极低频地震的速度相似。地震的迁移始于估计孔隙压力最大的外脊周围。地震的时空分布表明，孔隙压力松弛可以触发地震迁移。因此，地震的发生可能表明浅层板块界面较弱，在大地震后容易发生滑动。根据地震迁移信息，沿断层的渗透率可估计为3.7 x 10（-12）m（2）。（c）2021作者。由Elsevier B.V.出版。

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