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  1. 防災科研関係論文

Along-arc variation in seismic velocity structure related to variable growth of arc crust in northern Izu-Bonin intraoceanic arc

https://nied-repo.bosai.go.jp/records/4529
https://nied-repo.bosai.go.jp/records/4529
349f8dc5-c596-4ab0-9492-2e9908613df6
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Along-arc variation in seismic velocity structure related to variable growth of arc crust in northern Izu-Bonin intraoceanic arc
タイトル
言語 en
タイトル Along-arc variation in seismic velocity structure related to variable growth of arc crust in northern Izu-Bonin intraoceanic arc
言語
言語 eng
著者 Obana Koichiro

× Obana Koichiro

ja Obana Koichiro

en Obana Koichiro

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Kamiya Shinichiro

× Kamiya Shinichiro

ja Kamiya Shinichiro

en Kamiya Shinichiro

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Kodaira Shuichi

× Kodaira Shuichi

ja Kodaira Shuichi

en Kodaira Shuichi

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Suetsugu Daisuke

× Suetsugu Daisuke

ja Suetsugu Daisuke

en Suetsugu Daisuke

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Takahashi Narumi

× Takahashi Narumi

ja Takahashi Narumi

en Takahashi Narumi

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Takahashi Tsutomu

× Takahashi Tsutomu

ja Takahashi Tsutomu

en Takahashi Tsutomu

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Tamura Yoshihiko

× Tamura Yoshihiko

ja Tamura Yoshihiko

en Tamura Yoshihiko

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抄録
内容記述タイプ Other
内容記述 The Izu-Bonin arc is an intraoceanic island arc where the Pacific plate subducts beneath the Philippine Sea plate. Along-arc variation in thickness of the arc crust has been observed by previous active seismic surveys beneath the Izu-Bonin arc. We have imaged three-dimensional (3-D) seismic velocity structures in the northern Izu-Bonin arc using arrival time data of the earthquakes during 80 days of observations by ocean bottom seismographs and three permanent island seismic stations. Our 3-D velocity model indicates heterogeneous structure in the mantle wedge along the arc. Low-velocity anomalies related to upwelling flow in the mantle wedge are not uniform beneath the volcanic front. Low-velocity anomalies extending down to the subducting slab beneath the volcanic front coincide with thicker parts of the arc crust north of Aoga-shima and south of Sumisu-jima. This coincidence suggests that heterogeneous mantle upwelling flow fundamentally controls the growth of the arc crust. Along topographic highs in the forearc, low-velocity anomalies in the crust and uppermost mantle coincide with positive magnetic anomalies suggesting the presence of a remnant arc, providing further evidence of this view of arc crust formation.
言語 en
書誌情報 ja : GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
en : GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS

巻 11, 発行日 2010-08-11
出版者
言語 en
出版者 AMER GEOPHYSICAL UNION
ISSN
収録物識別子タイプ EISSN
収録物識別子 1525-2027
DOI
関連識別子 10.1029/2010GC003146
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