氷河期間氷河期間の表面負荷の変化の際に正常な断層の滑り速度の変動
1Institute of Geology, Department of Earth Sciences, ETH Zurich, Sonneggstr. 5, 8092 Zurich, Switzerland. rahetzel@uni-muenster.de
Nature
|May 6, 2005
まとめ
地球 地球 地球 地球 地球 地球
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- パレオシズモロジー (Paleoseismology) とは
- 四次地質学 四次地質学
背景:
- 地質学的データは,プレイストセーン後期/ホロセーン初期にワサッチと隣接する正常断層の滑り率が増加したことを示しています.
- この同期加速とホロセンの地震のクラスタリングの原因は不明である.
- 断層滑行加速と,最後の氷河期最大期以降のボネヴィル湖の縮小との潜在的な関連が提案されています.
研究 の 目的:
- 断層滑行加速における氷河後解凍と石層の反発の役割を評価する.
- 気候制御された表面負荷の変化が故障行動に及ぼす影響を調査するために.
主な方法:
- ディスクリート正規欠陥の有限要素モデリング.
- レオ学的に層を重ねた石層圏内の分析.
主要な成果:
- ボンネビル湖の回帰と山脈の脱氷によって引き起こされる石層のリバウンドは,高いホロセンの断層率の実現可能なメカニズムです.
- 氷河期後の解き放たれは滑り率を低下させ,石層の反発は滑り速さを促進する.
結論:
- 気候に起因する表面負荷の変化は,正常な故障滑り履歴に大きく影響します.
- リソスフィアの反発は,ホロセーン期のワサッチ地域における加速した断層滑落の妥当な説明を提供します.
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