Interplate coupling along the Nankai Trough off southwest Japan derived from GPS measurements
Interplate coupling along the Nankai Trough off southwest Japan derived from GPS measurements
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根据 GPS 测量得出的日本西南部南海海槽沿线的板间耦合
DOI：
10.1029/1999gl900145
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发表时间：
1999
影响因子：
5.2
通讯作者：
S. Miyazaki
中科院分区：
文献类型：
--
作者：
T. Ozawa;T. Tabei;S. Miyazaki
本文研究了日本西南海域南开海槽处菲律宾海与欧亚板块在震间期的耦合作用。板块耦合是通过叠加在稳态俯冲上的虚反正滑来模拟的。我们将板块界面划分为若干段，利用GPS水平速度数据估计每段之间的耦合。估计的耦合与板块运动模型预测的稳态俯冲速率基本一致。这表明南开海槽的电流耦合是如此强烈，以至于大部分的相对板块运动是由上覆板块前缘的缩短所吸收的。同震位错发生较大的段似乎实现了更强的震间耦合，反之亦然。1995 ~ 1996年板间耦合时间波动较小。
We investigate interplate coupling between the Philippine Sea and the Eurasian plates at the Nankai Trough off southwest Japan during the interseismic period. Plate coupling is modeled by imaginary backward normal slip superposed on the steady‐state subduction. We divide the plate interface into several segments, and estimate coupling on each segment from GPS horizontal velocity data. Estimated coupling is in general agreement with the rate of steady‐state subduction predicted from a plate motion model. This implies that current coupling at the Nankai Trough is so strong that much of the relative plate motion is taken up by shortening of the leading edge of the overriding plate. It seems that stronger interseismic coupling is realized on the segment where larger coseismic dislocation occurred, and vice versa. Time fluctuation of plate coupling from 1995 to 1996 is found on a small segment.