海洋変形断層に地震の滑り込み
1Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. rachel@seismology.harvard.edu
Nature
|March 10, 2001
まとめ
海洋変形断層の滑り方は,地震の深さや断裂メカニズムを分析することによってよりよく理解できます. 以前報告された地震前のスロースリップ前駆者は,おそらくモデリングアーティファクトである.
科学分野:
- 地球科学 地球科学 地球科学
- 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:
- 海洋変形断層は重要なプレート境界線ですが,その滑り方についてはほとんど理解されていません.
- 以前の研究では,ゆっくりとした地震の断裂と,海洋変形地震に先立つ検出可能なゆっくりとした滑落が示唆されていた.
- これらのプロセスを理解することは,地震の予測に影響を及ぼします.
研究 の 目的:
- ロマンシュとチェーンの変形断層の地震の深さと破裂メカニズムを調査する.
- 海洋石層における脆性破損の最大深さを決定する.
- 1994年のロマンシェ地震とその潜在的な前駆者を再評価する.
主な方法:
- 身体波のブロードバンド地震図をモデリングする.
- ロマンシュ川とチェーンの14回の地震を分析して,断層を変換する.
- 1994年のロマンシェ地震の源スペクトルの再計算.
主要な成果:
- ロマンシュ変換の地震は,チェーン変換の地震よりも体系的に深い.
- 海洋石層における脆性障害の最大深さは約600°Cである.
- 1994年のロマンチェ地震の波波は,一つの断層の深い滑りによってよくモデル化されています.
結論:
- 以前報告された1994年のロマンシェ地震のスロースリップの前兆は,モデル不確実性の人工物である可能性が高い.
- 地震の深さと断裂メカニズムは,海洋の変形断層の振る舞いに関する重要な洞察を提供します.
- この研究は,海洋の石層における脆性障害の理解を洗練している.
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