書誌事項
- タイトル別名
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- Three-Dimensional Velocity Structure in Southwestern Japan and Configuration of the Philippine Sea Slab Estimated by Double-Difference Tomography
- Double Difference Tomographyホウ ニ ヨル セイナン ニホン ノ 3ジゲン ジシンハ ソクド コウゾウ オヨビ フィリピンカイ プレート ノ ケイジョウ ノ スイテイ
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抄録
We estimated three-dimensional seismic velocity structure in and around the Philippine Sea plate subducting beneath southwestern Japan by applying the double-difference tomography method to arrival time data of earthquakes obtained by the dense nationwide seismic network (Kiban-network). Alow S-wave velocity and high Vp/Vs layer shallowly dipping toward the subduction direction of the slab and several km thick has been clearly imaged at locations immediately above the top of intraslab seismicity in a wide area from Tokai to Kyushu. Comparison with the location of the upper surface of the Philippine Sea slab estimated from seismic refraction surveys at four survey lines shows that this low S-wave velocity and high Vp/Vs layer corresponds to the crust of the Philippine Sea slab. This indicates that many of intraslab earthquakes are occurring in the slab mantle, suggesting that the location of the upper plate interface previously estimated only from spatial distribution of intraslab seismicity is not correct. Based on the presently obtained location of the low S-wave velocity and high Vp/Vs layer and hypocenter distribution of relocated intraslab earthquakes, we estimated the configuration of the upper surface of the Philippine Sea slab in the whole area of southwestern Japan.
収録刊行物
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- 地震 第２輯
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地震 第２輯 60 (1), 1-20, 2007
公益社団法人 日本地震学会
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詳細情報 詳細情報について
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- CRID
- 1390282679280336640
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- NII論文ID
- 10019840079
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- NII書誌ID
- AN00305741
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- ISSN
- 18839029
- 2186599X
- 00371114
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- NDL書誌ID
- 8938749
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可