气候变化领域集成服务门户(CCPortal): Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan

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DOI	10.1016/j.epsl.2021.116742
	Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan
	Hendriyana A.; Tsuji T.
发表日期	2021
ISSN	0012821X
卷号	558
英文摘要	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 3.7×10−12 m2. © 2021 The Author(s)
关键词	Nankai Trough plate boundary decollement pore pressure source estimation tectonic tremor tremor migration
英文关键词	Earthquakes; Location; Plates (structural components); Prisms; Shear flow; Tectonics; Accretionary prism; Geological conditions; Large earthquakes; Nankai subduction zone; Plate interfaces; Pore-pressure relaxation; Tectonic tremors; Very low frequency; Pore pressure; decollement; earthquake rupture; estimation method; microtremor; permeability; plate boundary; plate tectonics; porosity; seismic source; subduction zone; Japan
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203128
作者单位	International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, Fukuoka, Japan; Exploration and Engineering Seismology Research Group, Bandung Institute of Technology, Bandung, Indonesia; Department of Earth Resources Engineering, Kyushu University, Fukuoka, Japan; Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
推荐引用方式 GB/T 7714	Hendriyana A.,Tsuji T.. Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan[J],2021,558.
APA	Hendriyana A.,&Tsuji T..(2021).Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan.Earth and Planetary Science Letters,558.
MLA	Hendriyana A.,et al."Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan".Earth and Planetary Science Letters 558(2021).