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  1. 防災科研関係論文

Seismicity and structural heterogeneities around the western Nankai Trough subduction zone, southwestern Japan

https://nied-repo.bosai.go.jp/records/4267
https://nied-repo.bosai.go.jp/records/4267
aa08f924-beed-437a-8ab2-2626538bbce5
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Seismicity and structural heterogeneities around the western Nankai Trough subduction zone, southwestern Japan
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

Search repository
Yoshiyuki Kaneda

× Yoshiyuki Kaneda

en Yoshiyuki Kaneda

Search repository
抄録
内容記述タイプ Other
内容記述 The Nankai and Hyuga-nada seismogenic segments, in the western part of the Nankai subduction zone off southwestern Japan, have sometimes ruptured separately and sometimes simultaneously. To investigate the relationships among heterogeneities of seismic structure, spatial variation of the incoming plate, and the seismogenic segments, we carried out seismic observations in the western Nankai subduction zone and modeled the area with 3D seismic tomography using both onshore and offshore seismic data. Our seismic observations suggested that the pattern of seismicity is related to heterogeneities within the subducted plate rather than the seismogenic segments. The up-dip depth limit of seismicity along the plate boundary and in the oceanic crust is typically around 15 km, corresponding to the depth of dehydration of the oceanic crust. In addition, the seaward-extended seismicity observed where the subducted plate was considered to have rough internal structures. In the resulting velocity model, the up-dip limit of the area where the P-wave velocity just above the plate boundary exceeds 6 km/s corresponds to the up-dip limit of coseismic slip in the 1968 Hyuga-nada and 1946 Nankai earthquakes. Between the two coseismic rupture zones is an area of lower P-wave velocity about 40 km wide that is evidence of lateral heterogeneities in the upper plate along the trough-parallel direction. Structural heterogeneities in the upper plate may explain the variety of coseismic slip patterns in this region. (C) 2014 Elsevier B.V. All rights reserved.
言語 en
書誌情報 en : EARTH AND PLANETARY SCIENCE LETTERS

巻 396, p. 34-45
出版者
言語 en
出版者 ELSEVIER SCIENCE BV
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.2014.04.006
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