ワートン盆地地震の2つの結合平面に沿った同時破裂

D P Robinson¹, C Henry, S Das

¹Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK.

Science (New York, N.Y.)

|May 12, 2001

まとめ

2000年のワートン盆地地震は,2つの平面の同時破裂を伴い,新しいメカニズムを通じて構造的縮小に対応しました. この出来事は,地質プレート間の拡散変形地帯における著しいストレス蓄積を強調している.

科学分野:

地質物理学地質物理学とは地質物理学です.
地震学地震学とは
プレート・テクトニクス (プレート・テクトニクス)

背景:

ウォートン盆地 (Wharton Basin) は,インド・プレートとオーストラリア・プレートの間の分散変形地域である.
イントラプレート地震は,複雑な破裂行動を示す可能性があります.
拡散プレート境界の変形機構を理解することは,地震の危険性評価に不可欠です.

研究の目的:

2000年のワートン盆地地震の断裂の特徴を分析するために.
その破裂メカニズムが地域構造に及ぼす影響を調査する.
拡散変形ゾーンにおけるストレス蓄積を理解するために.

主な方法:

ブロードバンドテレシーズミックデータの分析.
断裂の特徴を決定するための地震波形モデリング.

主要な成果:

7.8のマグニチュードの地震は,2つの同時破裂したサブイベントで構成されていました.
これらのサブエベントは,2つのほぼ結合した平面を破裂させ,この領域で以前未知のメカニズムを通じて縮小を収納しました.
化石破裂地帯のより大きなサブイベントでは,高いストレス低下 (約. 20 MPa) である.

結論:

2000年のワートン盆地地震は,構造的縮小に対応するユニークな破裂の様子を示しています.
大きなストレスが蓄積され,分散プレート変形の領域で放出される可能性があります.
このイベントは,インド・オーストラリア・プレート境界地帯の複雑な構造についての新しい洞察を提供します.

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