ヒマラヤの大地震とチベット高原の地震
1CIRES and Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309, USA.
Nature
|November 10, 2006
まとめ
ヒマラヤの地震は,大ヒマラヤだけでなく,チベット高原の圧縮ストレスによって引き起こされます. この発見は,地震の更新時間を推定し,破裂パターンを理解するのに役立ちます.
科学分野:
- * 地震学について
- * 地質物理学について
- * テキトニクス
背景:
- * 伝統的なモデルは,ヒマラヤの地震は,グレター・ヒマラヤの近くの圧縮性ストレスの原因であると見なしている.
- *最近の地震画像は,インド・アジア衝突地帯の複雑な地下幾何学を明らかにしています.
研究 の 目的:
- * ヒマラヤの大地震を誘発するチベット高原の役割を調査する.
- *地震破裂の動態と再発の間隔の理解を深めること.
主な方法:
- *インド・アジア衝突の弾性モデルの開発と応用.
- * 最近画像化された地下界面の幾何学を統合.
- * モデルの予測と最近のヒマラヤ地震のデータとの比較.
主要な成果:
- * 南部のチベット高原の大部分は,ヒマラヤの大きな断裂を引き起こしています.
- *チベットの弾性ストレンのエネルギー放出は,ヒマラヤの破裂長さに比例する.
- *地震の滑り方と大きさは,破裂面積と相関しており, ~500年の更新時間を示唆しています.
- * モデルによって,再噴出現象や,長期間にわたって繰り返されるメガ地震の発生が説明されています.
結論:
- * 南部チベット高原は,ヒマラヤの地震を駆動するストレートエネルギーの重要な貯蔵庫です.
- *この発見は,地域における地震の再発と断裂の行動を理解するための新しい枠組みを提供します.
- * 弾性モデルは,プレート境界の謎めいた地震性パターンの洞察を提供します.
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