Onshore-offshore seismic transect from the eastern Nankai Trough to central Japan crossing a zone of the Tokai slow slip event
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- Kodaira Shuichi
- Institute for Research on Earth Evolution, Japan Agency Marine-Earth Science and Technology
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- Iidaka Takashi
- Earthquake Research Institute, University of Tokyo
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- Nakanishi Ayako
- Institute for Research on Earth Evolution, Japan Agency Marine-Earth Science and Technology
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- Park Jin-Oh
- Institute for Research on Earth Evolution, Japan Agency Marine-Earth Science and Technology
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- Iwasaki Takaya
- Earthquake Research Institute, University of Tokyo
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- Kaneda Yoshiyuki
- Institute for Research on Earth Evolution, Japan Agency Marine-Earth Science and Technology
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説明
In the summer of 2001, an onshore-offshore integrated seismic survey was carried out along a 485 km long profile crossing the eastern Nankai Trough and central Japan from the western edge of the Izu island arc. Seismic velocity and reflectivity images showongoing subduction of repeated ridges. Two ridges are clearly resolved, the Paleo Zenisu-south ridge and -north ridge located between the Nankai Trough and central Japan. The two subducting ridges are 12 km thick by 40 km wide, and 20 km thick by 60 km wide, respectively. We propose that the north ridge may have prevented the eastward propagation of co-seismic slip during the 1944 earthquake due to strong coupling. Highly reflective subducting oceanic crust is imaged at 25-45 km depth beneath central Japan, and has a 2 km high dome structure at 30-40 km depth, indicating an even deeper ridge structure. This highly reflective subducted oceanic crust overlaps with the high Poisson's ratio zone imaged in a seismic tomography study. From these relations, we propose that the Tokai silent slip can be attributed to a high pore pressure zone, which significantly extends the conditionally stable region at the top of the subducted crust.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 57 (10), 943-959, 2005
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206512913024
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- NII論文ID
- 10017470494
- 130003781074
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 7687759
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- 本文言語コード
- en
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- JaLC
- NDL
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