globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116894
论文题名:
Seismic evidence of fluid migration in northeastern Japan after the 2011 Tohoku-Oki earthquake
作者: Wang Q.-Y.; Campillo M.; Brenguier F.; Lecointre A.; Takeda T.; Yoshida K.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: fault strength ; fluid migration ; low frequency earthquakes ; pore pressure ; seismic velocity drop anomaly ; tiltmeter observation
英文关键词: Diffusion in liquids ; Earthquakes ; Pore pressure ; Fault strength ; Fluid migration ; Low-frequency earthquakes ; Lower frequencies ; Seismic velocities ; Seismic velocity drop anomaly ; Tiltmeter observation ; Tohoku-Oki earthquakes ; Upper crust ; Velocity changes ; Volcanoes ; correlation ; deformation ; earthquake swarm ; fault geometry ; fluid flow ; ground motion ; pore pressure ; seismic noise ; seismic velocity ; strength ; Tohoku earthquake 2011 ; trigger mechanism ; Honshu ; Japan
英文摘要: We use ambient-noise-based seismic monitoring to detect an anomalous seismic velocity decrease (∼0.01%) widely distributed in Honshu that arose about 1 year after the 2011 Mw 9.0 Tohoku-Oki earthquake. The anomaly is located along the central quaternary volcanic axis, and it suggests that the changes are related to volcanic processes. After correction for possible external environmental forcing-related velocity changes, the anomaly in the seismic velocity remains, which implies that it is associated with some internal physical process. We show a general strong positive correlation between the seismic velocity changes and the intensity of ground motion derived from the daily cumulative seismic moment. However, the lack of correlation during the anomaly itself reveals that this reduction is not directly caused by earthquake shaking. Tiltmeter low-pass observations show temporal variations that are correlated with the velocity changes. These observations strengthen the hypothesis of actual physical deformation. A previously reported decrease in fault strength (∼10%) for the same period as the velocity anomaly further supports a physical property change in the upper crust. We also note a simultaneous increase in activity of low-frequency events in the volcanic area, which suggests an increase in pore pressure in the upper crust. We propose that the observed anomalous seismic velocity decrease in early 2012 is due to an increase in pore pressure induced by an upward fluid migration, which at the same time triggered the increase in fluid-driven swarm seismicity and low-frequency events. We recall the depth-dependent seismic velocity changes in Honshu and derive an average diffusion of 1 m2/s over around 11 months after the Tohoku-Oki earthquake. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165705
Appears in Collections:气候变化与战略

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作者单位: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, United States; Université Grenoble Alpes, CNRS, ISTerre, Grenoble, France; National Research Institute for Earth Science and Disaster Resilience, Japan; Department of Geophysics, Graduate School of Science, Tohoku University, Japan

Recommended Citation:
Wang Q.-Y.,Campillo M.,Brenguier F.,et al. Seismic evidence of fluid migration in northeastern Japan after the 2011 Tohoku-Oki earthquake[J]. Earth and Planetary Science Letters,2021-01-01,563
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