Dynamic deformation of the accretionary prism excites very low frequency earthquakes

被引：186

作者：

Ito, Y ^{[1
]}

Obara, K ^{[1
]}

机构：

[1] Natl Res Inst Earth Sci & Disaster Prevent, Tsukuba, Ibaraki 3050006, Japan

来源：

GEOPHYSICAL RESEARCH LETTERS | 2006年 / 33卷 / 02期

关键词：

D O I：

10.1029/2005GL025270

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We have detected anomalous very-low- frequency earthquakes within the accretionary prism along the Nankai Trough, southwestern Japan. Centroid moment tensor inversion analysis reveals that the earthquake hypocenters are distributed at similar to 10 km depth above the upper surface of the subducting Philippine Sea Plate, and within 50-70 km landward of the trough axis. The focal mechanisms indicate reverse faulting. Their hypocenters are distributed beneath a deformation zone of an accretionary prism in sea-floor topography. These observations suggest that the occurrence of very-low-frequency earthquakes is related to numerous reverse fault systems within the accretionary prism, and that the earthquakes reflect the dynamics of deformation within this accretionary prism.

引用

页数：4

共 18 条

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