メガスラストの地震発生地帯とエピソード的震動と滑り方のレオロギー的な分離
Xiang Gao1,2, Kelin Wang3,4
1Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China.
Nature
|March 7, 2017
まとめ
サブダクションゾーンにおけるエピソディックな震えと遅い滑り (ETS) は,新しいモデルによって説明されています. 高温と毛孔流体の圧力は,異なる地震とETSゾーンを作り,断層の振る舞いの観察を調和させます.
科学分野:
- 地理学
- 構造学
- 地震学
背景:
- エピソード的な震えと遅い滑り (ETS) は,若い,暖かいスラブを持つ潜水地帯で発生します.
- ETSのメカニズムと地震発生地帯との関係は不明である.
- 現存するモデルは,地震発生地とETS領域の間の観測された空間的分離と矛盾しています.
研究 の 目的:
- ETSの地質条件を統一するモデルを提案する.
- 地震発生地域とETS領域の空間的関係を説明する.
- ETSにおける断層領域のレオロギーの役割を調査する.
主な方法:
- 数値的な熱モデリング
- 熱石油学的に制御された断層ゾーンのレオロギー (摩擦対粘性切断) の試験.
主要な成果:
- 温暖な沈殿板の高温は,マントルの角の前に地震発生地帯を終了します.
- マントルの角の近くの高孔液圧は,ETSを発生させる孤立した摩擦地帯を形成する.
- 半摩擦または粘着性のセグメントが地震発生地とETSゾーンを分離します.
結論:
- 提案されたモデルは,ETSと故障の振る舞いの異なった観察を調和させる.
- 大規模な断層の滑り方や地震発生を研究するための概念的枠組みを提供している.
- このモデルは,潜水地帯の力学における熱と流体条件の支配的な役割を強調しています.
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