カリフォルニア州にある主要なストライクスリップ断層の近くにある側面P-速度梯度
Science (New York, N.Y.)
|July 10, 1981
まとめ
浅い結晶岩 P-波の速度は,大きな断層の近くで,破裂が増加したために落ちます. この断裂は,浅い地殻が構造的ストレスにどのように反応するかに影響し,地震波の伝播に影響します.
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:
- ガーロック断層とサンアンドレアス断層は,主要なストライクスリップ断層システムです.
- 地震波の速度は岩の性質とストレス条件によって影響を受けます.
研究 の 目的:
- P波の速度と主要なストライクスリップ断層の近くとの関係を調査する.
- 構造的ストレスに対する浅層地殻の反応における断裂の役割を理解する.
主な方法:
- 浅層の結晶岩におけるP波速度データの分析.
- 速度のグラデーションと断層付近のシアストレスのプロフィールとの相関.
主要な成果:
- P波の速度は,断層から20キロメートル以上で秒速約5.5キロメートルから,断層から2キロメートル未満で秒速約3キロメートルまで低下する.
- 横方向の速度のグラデーションが観察され,シアストレスのプロファイルと密接に一致しました.
- より近い断層の断裂の増加が,速度の梯度の原因として提案されています.
結論:
- 浅層の結晶岩の断裂は,主要なストライクスリップ断層の近くの地震波の速度に大きな影響を与えます.
- 観測された速度グラデーションは,おそらく,構造的ストレスに対する浅い地殻の反応を支配する破裂の増加によって引き起こされている.
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