globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116742
论文题名:
Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan
作者: Hendriyana A.; Tsuji T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 558
语种: 英语
中文关键词: 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
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)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165506
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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

Recommended Citation:
Hendriyana A.,Tsuji T.. Influence of structure and pore pressure of plate interface on tectonic tremor in the Nankai subduction zone, Japan[J]. Earth and Planetary Science Letters,2021-01-01,558
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