超低摩擦ヒーリングは,繰り返される緩やかな滑り事件を説明します
Srisharan Shreedharan1,2, Demian Saffer1,3, Laura M Wallace1,4
1Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, USA.
まとめ
浅い潜水地帯には様々な地形滑りがあります. この研究では,ヒクランギの限界での摩擦治癒率がほぼゼロであることを明らかにし,頻繁な,小さなストレスドロップの遅いスリップイベント (SSE) を説明しています.
科学分野:
- 地理学
- 構造学
- 地球科学
背景:
- 浅い潜水メガスストのプレート運動には様々な構造的滑り込みモードが含まれています.
- これらの様々な滑り方を制御する摩擦の性質は完全に理解されていません.
- 摩擦治癒,地震の間の断層の強化は,重要な特性です.
研究 の 目的:
- 北部ヒクランギの巨大地殻に沿った物質の摩擦特性について調べるため
- 浅い緩やかな滑りイベント (SSEs) を特徴とする領域での摩擦治癒率を決定する.
- 浅いSSEの低ストレスドロップと短い再発時間の背後にあるメカニズムを解明する.
主な方法:
- 北部ヒクランギの巨大岩盤に沿った岩石のサンプルと物質の分析
- 実験室での実験または現場でのデータを用いて摩擦治癒率を測定する.
- 治癒率と観察されたスリップ行動,ストレス低下,再発間隔の相関関係.
主要な成果:
- 北部ヒクランギの巨大岩石の摩擦治癒率はほぼゼロ ("0年あたり<0,0001).
- これらの低い治癒率は,潜水地帯で一般的な弱いフィロシリケートと関連しています.
- 発見は,浅いSSEの特徴的な低ストレスドロップ (<50kPa) と短い再発時間 (1〜2年) のメカニズムを提供します.
結論:
- 摩擦による治癒の速度はゼロに近いので 溝の近くで頻繁に,小さなストレスドロップで,ゆっくりと破裂することがあります.
- 弱いフィロシリケートは,潜水縁の浅いSSEを収容する上で重要な役割を果たす可能性があります.
- フリクションヒーリングを理解することは,プレート構造と地震の動態を理解するために不可欠です.
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