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  1. 防災科研関係論文

Relationship between hypocentral distributions and Vp/Vs ratio structures inferred from dense seismic array data: a case study of the 1984 western Nagano Prefecture earthquake, central Japan

https://nied-repo.bosai.go.jp/records/4682
https://nied-repo.bosai.go.jp/records/4682
84a0bdce-fbef-49c1-abd5-3f8e234db3f6
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Relationship between hypocentral distributions and Vp/Vs ratio structures inferred from dense seismic array data: a case study of the 1984 western Nagano Prefecture earthquake, central Japan
言語
言語 eng
著者 Issei Doi

× Issei Doi

en Issei Doi

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Shunta Noda

× Shunta Noda

en Shunta Noda

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Yoshihisa Iio

× Yoshihisa Iio

en Yoshihisa Iio

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Shigeki Horiuchi

× Shigeki Horiuchi

en Shigeki Horiuchi

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Shoji Sekiguchi

× Shoji Sekiguchi

en Shoji Sekiguchi

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抄録
内容記述タイプ Other
内容記述 We conducted a three-dimensional traveltime tomographic reconstruction in and around the source region of the 1984 western Nagano Prefecture earthquake to investigate the generation process for the main shock and associated swarm activity. Up to 220 000 high-resolution traveltime records (2 ms error) were compiled from a dense seismic network. From these records, we performed accurate, high-resolution calculations to estimate hypocentre distributions and three-dimensional velocity structure. Most hypocentres aligned along the same path or within the same plane, rather than in three-dimensional clusters. Hypocentres in the swarm region are located in regions with low Vp/Vs ratios, while few earthquakes occurred in regions with high or normal Vp/Vs ratios. We suggest that differences in the number of small fractures and fluid content between these two regions influenced the seismic activity. Rupture propagation associated with the main shock appears to be confined by relatively higher Vp/Vs surroundings, and a low-velocity region which limits its vertical extent.
言語 en
書誌情報 en : GEOPHYSICAL JOURNAL INTERNATIONAL

巻 195, 号 2, p. 1323-1336, 発行日 2013-11
出版者
言語 en
出版者 OXFORD UNIV PRESS
ISSN
収録物識別子タイプ EISSN
収録物識別子 1365-246X
DOI
関連識別子 10.1093/gji/ggt312
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