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Variations of fluid pressure within the subducting oceanic crust and slow earthquakes

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Title: Variations of fluid pressure within the subducting oceanic crust and slow earthquakes
Authors: Kato, Aitaro Browse this author
Iidaka, Takashi Browse this author
Ikuta, Ryoya Browse this author
Yoshida, Yasuhiro Browse this author
Katsumata, Kei Browse this author →KAKEN DB
Iwasaki, Takaya Browse this author
Sakai, Shin'ichi Browse this author
Thurber, Clifford Browse this author
Tsumura, Noriko Browse this author
Yamaoka, Koshun Browse this author
Watanabe, Toshiki Browse this author
Kunitomo, Takahiro Browse this author
Yamazaki, Fumihito Browse this author
Okubo, Makoto Browse this author
Suzuki, Sadaomi Browse this author
Hirata, Naoshi Browse this author
Issue Date: 29-Jul-2010
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 37
Start Page: L14310
Publisher DOI: 10.1029/2010GL043723
Abstract: We show fine‐scale variations of seismic velocities and converted teleseismic waves that reveal the presence of zones of high‐pressure fluids released by progressive metamorphic dehydration reactions in the subducting Philippine Sea plate in Tokai district, Japan. These zones have a strong correlation with the distribution of slow earthquakes, including long-term slow slip (LTSS) and low-frequency earthquakes (LFEs). Overpressured fluids in the LTSS region appear to be trapped within the oceanic crust by an impermeable cap rock in the fore-arc, and impede intraslab earthquakes therein. In contrast, fluid pressures are reduced in the LFE zone, which is deeper than the centroid of the LTSS, because there fluids are able to infiltrate into the narrow corner of the mantle wedge, leading to mantle serpentinization. The combination of fluids released from the subducting oceanic crust with heterogeneous fluid transport properties in the hanging wall generates variations of fluid pressures along the downgoing plate boundary, which in turn control the occurrence of slow earthquakes.
Rights: Copyright 2010 by the American Geophysical Union
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 勝俣 啓

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