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  1. 防災科研関係論文

2004年10月23日新潟県中越地震の F-net モーメントテンソル解の空間分布

https://nied-repo.bosai.go.jp/records/5862
https://nied-repo.bosai.go.jp/records/5862
2692731c-256e-4898-84b7-9c1b8246802d
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル 2004年10月23日新潟県中越地震の F-net モーメントテンソル解の空間分布
タイトル
言語 en
タイトル Spatial Distribution of F-net Moment Tensor Solutions of the Mid Niigata Prefecture Earthquake in 2004
言語
言語 jpn
著者 松本 拓己

× 松本 拓己

ja 松本 拓己

en MATSUMOTO Takumi

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伊藤 喜宏

× 伊藤 喜宏

ja 伊藤 喜宏

en ITO Yoshihiro

Search repository
松林 弘智

× 松林 弘智

ja 松林 弘智

en MATSUBAYASHI Hirotoshi

Search repository
抄録
内容記述タイプ Other
内容記述 The 2004 Mid Niigata Prefecture earthquake (<i>M<sub>J</sub></i>6.8) that occurred on October 23, 2004 is the 2nd largest intra-plate earthquake after F-net, the broadband seismograph network of the National Research Institute for Earth Science and Disaster Prevention (NIED) was established with a dense and homogeneous distribution all over Japan. We determined moment tensor solutions of the main shock, aftershocks, and earthquakes occurred around mid Niigata prefecture from January 1997 to October 22, 2004, using a surface wave with an extended method of the NIED F-net routine processing. The horizontal distance to the station is rounded to the nearest interval of 1km, and the variance reduction approach is applied to a focal depth from 2km with an interval of 1km. We obtain the moment tensors of 117 events with <i>M<sub>J</sub></i> exceeding 2.8 and spatial distribution of these moment tensors. The focal mechanism of main shock, aftershocks, earthquakes before main shock, is mainly of the reverse fault type with P axes trending WNW-ESE. But the focal mechanism of 15 percent aftershocks is the strike-slip type. There are high dip angle reverse faults, in deep part, and low dip angle reverse faults in shallow part.
言語 ja
抄録
内容記述タイプ Other
内容記述 The 2004 Mid Niigata Prefecture earthquake (<i>M<sub>J</sub></i>6.8) that occurred on October 23, 2004 is the 2nd largest intra-plate earthquake after F-net, the broadband seismograph network of the National Research Institute for Earth Science and Disaster Prevention (NIED) was established with a dense and homogeneous distribution all over Japan. We determined moment tensor solutions of the main shock, aftershocks, and earthquakes occurred around mid Niigata prefecture from January 1997 to October 22, 2004, using a surface wave with an extended method of the NIED F-net routine processing. The horizontal distance to the station is rounded to the nearest interval of 1km, and the variance reduction approach is applied to a focal depth from 2km with an interval of 1km. We obtain the moment tensors of 117 events with <i>M<sub>J</sub></i> exceeding 2.8 and spatial distribution of these moment tensors. The focal mechanism of main shock, aftershocks, earthquakes before main shock, is mainly of the reverse fault type with P axes trending WNW-ESE. But the focal mechanism of 15 percent aftershocks is the strike-slip type. There are high dip angle reverse faults, in deep part, and low dip angle reverse faults in shallow part.
言語 en
書誌情報 ja : 地震. 2輯
en : Zisin (Journal of the Seismological Society of Japan. 2nd ser.)

巻 58, 号 4, p. 427-443, 発行日 2006-03-31
出版者
言語 ja
出版者 公益社団法人 日本地震学会
出版者
言語 en
出版者 SEISMOLOGICAL SOCIETY OF JAPAN
ISSN
収録物識別子タイプ ISSN
収録物識別子 0037-1114
DOI
関連識別子 10.4294/zisin1948.58.4_427
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