地震学:サンダ海峡の地震リスク
Suleyman S Nalbant1, Sandy Steacy, Kerry Sieh
1School of Environmental Sciences, University of Ulster, Coleraine, County Derry BT52 1SA, UK.
Nature
|June 10, 2005
まとめ
2005年のスンダ大震災は,2004年のスマトラ・アンダマン地震によって引き起こされた. この地震活動は,南部のメガスラストへのストレスを増加させ,将来の地震の候補にしました.
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
- テクトニクス (地質学) とは
背景:
- サンダの大規模地震は,2004年12月に同様の地震が起きた後,2005年3月28日に発生した.
- この2005年の断裂は,2004年のスマトラ・アンダマン地震と空間的に結びついていた.
研究 の 目的:
- 2005年のスンダ大震災後の誘発メカニズムとストレス移転を調査する.
- 隣接するメガスラストセグメントと断層の地震力を評価する.
主な方法:
- 2005年の地震からの地震データの分析.
- ストレスのモデリングにより,近くの構造物のストレスの変化を計算します.
- メンタワイセグメントの古地震データのレビュー.
主要な成果:
- 2005年の地震は,非常に小さなストレス (約0.1バー) によって引き起こされました.
- 破裂は,破裂地帯の南,バトゥ島とメンタワイ島近くのメガスラストのストレスを増加させた.
- スマトラ断層でもストレスが増えたことが観察されました.
- 古代地震の証拠は,メンタワイセグメントが地震周期の遅い段階にあることを示しています.
結論:
- 2005年のスンダ大震災は,2004年の地震からのストレス移転の結果であった.
- サンダ・メガトラストのメンタワイセグメントは,高度な地震サイクルがあるため,将来の誘発地震に非常に敏感です.
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