1999年のヘクター鉱山地震によって引き起こされた近くの断層の変形
Yuri Fialko1, David Sandwell, Duncan Agnew
1Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093, USA. fialko@radar.ucsd.edu
まとめ
インターフェロメトリック合成開口レーダー (ISAR) は1999年のヘクター鉱山地震中に断層運動を明らかにした. 断層地帯は,異なった機械的性質を示し,地震のストレス変化に弾性的に反応した.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- リモートセンシング (リモートセンサー)
背景:
- 1999年のヘクター鉱山地震では,地表が大きく変形した.
- 地震発生時の断層の振る舞いを理解することは,地震の危険性評価に不可欠です.
研究 の 目的:
- 1999年のヘクター鉱山地震に関連した表面変形パターンを,インターフェロメトリック合成開口レーダー (ISAR) を使用して分析する.
- カリフォルニア州東部のシェアゾーン内の断層地帯の機械的性質を調査する.
主な方法:
- Interferometric Synthetic Aperture Radar (ISAR) を使用して,表面の移動を観察しました.
- キロメートル幅の断層地帯の縦横の動きを分析した.
主要な成果:
- メインの断裂付近の複数の断層で,ミリからセンチメートルまでの移転が観察されました.
- いくつかの断層部分の逆行運動が文書化されており,長期の地質滑りとは対照的です.
- 断層圏内の効果的切断モジュールが推論的に低下し,周りの地殻と機械的に異なることを示唆しています.
結論:
- 断層地帯は従順な行動を示し,共地震的ストレス変化に弾性的に反応する.
- 観測された移転は,断層地帯は,周囲の地殻と比較して機械的にユニークな構造であることを示しています.
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