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Over nearly this same period of time the Japanese terrestrial HiNet array has enabled detection of small earthquakes across the breadth of the accretionary prism. The records include several formation fluid pressure anomalies and concurrent local very-low-frequency earthquake (VLFE) swarms. In the subducting plate, pressure anomalies are most commonly slow negative steps that are inferred to reflect dilatational strain associated with slow slip on the subduction thrust fault in the areas of VLFE activity In three instances, concurrent positive impulsive anomalies are observed in the prism; these are inferred to reflect contraction when slip reaches the location of Hole 808I. The spatial distribution of VLFEs suggests that slow slip may occur in patches that cumulatively span the seaward half of the subduction prism. Two anomalies occurred at times of the largest earthquakes in the region, the September 2004 Mw 7.7 off-Kii earthquake 220 km to the northeast, and the March 2011 Mw 9.0 Tohoku earthquake roughly 900 km to the northeast In the subducting plate, the observed changes in pressure are abrupt and consistent in sign with the expected coseismic strain (contractional and dilatational, respectively). In the case of the Tohoku earthquake, the co-seismic pressure decrease was followed 12 days later by an additional but slow decrease, and by an impulsive but complex and long-lived increase in the accretionary prism Hole 808I. In this instance, co-seismic cross-strike stress may have triggered post-seismic slip and the deformation seen in the plate and prism. Given the great distance from the Tohoku epicenter and small change in stress estimated at the Nankai observatory sites (ca. 7 kPa shear stress), triggering of local slip would require the outer subduction thrust and overlying prism in this region to be very fragile. To what degree this state might vary with time is not known, but tracking episodic slip in the seaward part of this and other subduction zones using formation-fluid-pressure and VLFE monitoring may provide valuable dues about the evolution of subduction faults through their thrust earthquake cycles. Crown Copyright (C) 2013 Published by Elsevier B.V. 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  1. 防災科研関係論文

Episodic deformation and inferred slow slip at the Nankai subduction zone during the first decade of CORK borehole pressure and VLFE monitoring

https://nied-repo.bosai.go.jp/records/4266
https://nied-repo.bosai.go.jp/records/4266
8b670623-ff5f-489a-946b-8a4208cb56f4
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Episodic deformation and inferred slow slip at the Nankai subduction zone during the first decade of CORK borehole pressure and VLFE monitoring
言語
言語 eng
著者 Earl Davis

× Earl Davis

en Earl Davis

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Masataka Kinoshita

× Masataka Kinoshita

en Masataka Kinoshita

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Keir Becker

× Keir Becker

en Keir Becker

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Kelin Wang

× Kelin Wang

en Kelin Wang

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Youichi Asano

× Youichi Asano

en Youichi Asano

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Yoshihiro Ito

× Yoshihiro Ito

en Yoshihiro Ito

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抄録
内容記述タイプ Other
内容記述 With new data recovered in December 2011 and November 2012 from two Ocean Drilling Program (ODP) CORK (circulation obviation retrofit kit) borehole observatories in the toe of the Nankai subduction zone accretionary prism (Hole 8081) and in the subducting Philippine Sea plate (Hole 1173B) off Southwestern Japan, records of formation fluid pressure now span over 10 yr. Over nearly this same period of time the Japanese terrestrial HiNet array has enabled detection of small earthquakes across the breadth of the accretionary prism. The records include several formation fluid pressure anomalies and concurrent local very-low-frequency earthquake (VLFE) swarms. In the subducting plate, pressure anomalies are most commonly slow negative steps that are inferred to reflect dilatational strain associated with slow slip on the subduction thrust fault in the areas of VLFE activity In three instances, concurrent positive impulsive anomalies are observed in the prism; these are inferred to reflect contraction when slip reaches the location of Hole 808I. The spatial distribution of VLFEs suggests that slow slip may occur in patches that cumulatively span the seaward half of the subduction prism. Two anomalies occurred at times of the largest earthquakes in the region, the September 2004 Mw 7.7 off-Kii earthquake 220 km to the northeast, and the March 2011 Mw 9.0 Tohoku earthquake roughly 900 km to the northeast In the subducting plate, the observed changes in pressure are abrupt and consistent in sign with the expected coseismic strain (contractional and dilatational, respectively). In the case of the Tohoku earthquake, the co-seismic pressure decrease was followed 12 days later by an additional but slow decrease, and by an impulsive but complex and long-lived increase in the accretionary prism Hole 808I. In this instance, co-seismic cross-strike stress may have triggered post-seismic slip and the deformation seen in the plate and prism. Given the great distance from the Tohoku epicenter and small change in stress estimated at the Nankai observatory sites (ca. 7 kPa shear stress), triggering of local slip would require the outer subduction thrust and overlying prism in this region to be very fragile. To what degree this state might vary with time is not known, but tracking episodic slip in the seaward part of this and other subduction zones using formation-fluid-pressure and VLFE monitoring may provide valuable dues about the evolution of subduction faults through their thrust earthquake cycles. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : EARTH AND PLANETARY SCIENCE LETTERS

巻 368, p. 110-118
出版者
言語 en
出版者 ELSEVIER
ISSN
収録物識別子タイプ EISSN
収録物識別子 1385-013X
DOI
関連識別子 10.1016/j.epsl.2013.03.009
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