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  1. 防災科研関係論文

Imaging of the subducted kyushu-palau ridge in the hyuga-nada region, western nankai trough subduction zone

https://nied-repo.bosai.go.jp/records/4391
https://nied-repo.bosai.go.jp/records/4391
781a1478-88af-438b-b80d-e92cccd7ca9e
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Imaging of the subducted kyushu-palau ridge in the hyuga-nada region, western nankai trough subduction zone
言語
言語 eng
著者 Yojiro Yamamoto

× Yojiro Yamamoto

en Yojiro Yamamoto

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Koichiro Obana

× Koichiro Obana

en Koichiro Obana

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Tsutomu Takahashi

× Tsutomu Takahashi

en Tsutomu Takahashi

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Ayako Nakanishi

× Ayako Nakanishi

en Ayako Nakanishi

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Shuichi Kodaira

× Shuichi Kodaira

en Shuichi Kodaira

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Yoshiyuki Kaneda

× Yoshiyuki Kaneda

en Yoshiyuki Kaneda

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抄録
内容記述タイプ Other
内容記述 We performed 3D seismic tomography of the Hyuga-nada region, western Nankai subduction zone, to investigate the relationship of the subducted part of Kyushu-Palau Ridge (KPR) to coseismic rupture propagation, seismicity, and shallow very low frequency earthquakes. Combining active-source and passive-source data recorded both onshore and offshore, we imaged the deep slab from near the trough axis to the coastal area. Our results show the subducted KPR as a low-velocity belt oriented NW-SE extending down the plate boundary to around 30. km depth. At this depth, we suggest that the subducted KPR detaches from the slab and becomes underplated on the overriding continental plate. As the coseismic slip areas of past large earthquakes do not extend into the subducted KPR, we suggest that it may inhibit rupture propagation. The interior of the subducted KPR shows active intraslab seismicity with a wide depth distribution. Shallow very low frequency earthquakes are continuously active above the location of the subducted KPR, whereas they are intermittent to the northeast of the subducted KPR. Thus, the subducted KPR appears to be an important factor in coseismic rupture propagation and seismic phenomena in this region. © 2013 Elsevier B.V.
言語 en
書誌情報 en : Tectonophysics

巻 589, p. 90-102
ISSN
収録物識別子タイプ ISSN
収録物識別子 0040-1951
DOI
関連識別子 10.1016/j.tecto.2012.12.028
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