書誌事項
- タイトル別名
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- Mechanism Generating Earthquakes in Subduction Zones
- 沈み込み帯の地震の発生機構 : 地殻流体に規定されて発生する沈み込み帯の地震
- シズミ コミ タイ ノ ジシン ノ ハッセイ キコウ : チカク リュウタイ ニ キテイ サレテ ハッセイ スル シズミ コミ タイ ノ ジシン
- ―地殻流体に規定されて発生する沈み込み帯の地震―
- Vital Role of Geofluids in Earthquake Generation
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抄録
The mechanisms that generate the three main types of earthquake in subduction zones are discussed addressing their relations to geofluids. Studies on the spatial distribution of earthquakes and seismic velocity structure within the subducted slab provide evidence that strongly supports the dehydration embrittlement hypothesis for the generation of intermediate-depth intraslab earthquakes. Detailed imaging of the seismic velocity structure in and around plate boundary zones suggests that interplate coupling is mainly controlled by local fluid over-pressure. Seismic tomography studies show the existence of inclined sheet-like seismic low-velocity zones in the mantle wedge, not only in Tohoku but also in other areas in Japan, which perhaps correspond to the upwelling flow of the subduction-induced convection system. These upwelling flows reach the Moho directly beneath the volcanic areas, suggesting that those volcanic areas are formed by the upwelling flows. Aqueous fluids derived from the slab are probably transported up through the upwelling flows to the arc crust, where they might weaken the surrounding crustal rocks and finally cause shallow inland earthquakes. All of these observations suggest that geofluids expelled from the subducting slab play an important role in the generation of earthquakes in subduction zones.
収録刊行物
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- 地学雑誌
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地学雑誌 121 (1), 128-160, 2012
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390001204237718400
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- NII論文ID
- 10031146363
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 023566410
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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
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可