南海プレート境界の不均質すべりと前弧テクトニクスの相関抽出

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Author: 水上, 知行ほか

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Publication date: 2016-06-14

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Note (General)：: 金沢大学理工研究域地球社会基盤学系南海沈み込み境界の巨大地震発生域周縁に観測されるゆっくり滑りの不均質の地質学的実態と成因を理解するため、上盤マントルの蛇紋岩化の岩石学的モデルに基づき、構造地質学と地球物理学と地形年代学による多角的アプローチから検証に取り組んだ。その結果（１）ゆっくり滑りに伴う深部...

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Material Type: 文書・図像類
Title: 南海プレート境界の不均質すべりと前弧テクトニクスの相関抽出
Author/Editor: 水上, 知行
Mizukami, Tomoyuki
Author Heading: 水上, 知行
Mizukami, Tomoyuki
Publication Date: 2016-06-14
Publication Date (W3CDTF): 2016-06-14
Alternative Title: Examination of tectonic relationships between heterogeneous slow slip behaviors and forearc deformation in the Nankai subduction zone
Periodical title: 平成27(2015)年度科学研究費補助金基盤研究(B) 研究成果報告書 = 2015 Fiscal Year Final Research Report
No. or year of volume/issue: 2012-04-01 - 2016-03-31
Volume: 2012-04-01 - 2016-03-31
Pages: 6p.-
Text Language Code: jpn
Subject Heading: プレート境界
スロースリップ
地殻変動
蛇紋岩
Target Audience: 一般
Note (General): 金沢大学理工研究域地球社会基盤学系
南海沈み込み境界の巨大地震発生域周縁に観測されるゆっくり滑りの不均質の地質学的実態と成因を理解するため、上盤マントルの蛇紋岩化の岩石学的モデルに基づき、構造地質学と地球物理学と地形年代学による多角的アプローチから検証に取り組んだ。その結果（１）ゆっくり滑りに伴う深部低周波微動と天然蛇紋岩構造がサイズ分布において対比できること、（２）四国西部の重力異常の東西変化や深部低周波微動の特徴的な長さの東西変化が蛇紋岩化の違いで説明できる可能性、（３）四国の河川の離水年代からプレート界面不均質への地殻応答が制約できる可能性が見えた。プレート境界深部の歪み解消過程の定量化へ一つの道筋をつける成果と言える。
Slow slips at subduction boundaries are considered to be critical in stress build-up on the megathrust zones. We examine petrological controls on the mechanism and heterogeneous distribution of slip sources using multidisciplinary approaches including structural geology, geophysics and geomorphological chronology. The following results on the Nankai subduction zone will be an important step for practical understanding of slow slip phenomena: Layered structures of antigorite serpentinite formed through open system crust-mantle interaction show an exponential scaling relationship similar to deep low frequency tremors (DLFTs); The lateral variation in gravitational anomaly and scaling relationship between duration and amplitude of DLFTs can be explained by variable extents of serpentinization consistent with the present thermal structure of the Nankai region; Water separation ages successfully constrain the development of the Shimanto River system in response to the plate coupling.
研究課題/領域番号:24340122, 研究期間(年度):2012-04-01 - 2016-03-31
DOI: 10.24517/00051970
Access Restrictions: 限定公開
Related Material: https://kaken.nii.ac.jp/search/?qm=80396811
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24340122/
https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-24340122/24340122seika/
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 金沢大学 : 金沢大学学術情報リポジトリKURA