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曲江断裂 |
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全新世活动 |
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滑动速率 |
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断错地貌 |
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荆振杰 |
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刘凤香 |
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张井飞 |
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谢富仁 |
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Article by Jing, Z. J. |
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Article by Liu, F. X. |
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Article by Zhang, J. F. |
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Article by Xie, F. R. |
高精度 SPOT 卫星影像和野外地质调查表明，曲江断裂南东段断错山前冲沟及河流Ⅰ级和Ⅱ级阶地，在探槽中见到断裂断错全新世地层，是一条右旋走滑的全新世活动断裂，兼有逆冲性质，断裂的最新活动是 1970 年通海 7. 8 级地震。对曲江断裂典型走滑断错地貌进行研究，曲江断裂南东段在五街一带水平滑动速率为 (3. 36 ±0. 1) mm/a，白林山一带水平滑动速率为 (3. 21 ±0. 3) mm/a。
The high- resolution digital SPOT images and field investigation show that the southeastern segment of Qujiang fault offset the youngest gullies and the I and II grade fluvial terraces． Qujiang fault is a Holocene active right- lateral strike- slip fault，along with some reverse component which offset the Holocene deposit in the trench． The latest activity event is the 7. 8 earthquake in Tonghai in 1970． Investigating typical landform offset by Qujiang fault，at the field of the Wujie and Bailinshan where is the southeastern segment of Qujiang fault，the right- lateral slip rate of this fault is (3. 36 ±0. 1) mm/a and (3. 21 ±0. 3) mm/a，respectively．