| 滇西北发震构造条件及其与鲜水河断裂带的对比 |
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| 引用本文： | 马瑾.滇西北发震构造条件及其与鲜水河断裂带的对比[J].地震地质,1988,10(4):35. |
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| 作者姓名： | 马瑾 |
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| 作者单位： | 国家地震局地质研究所 |
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| 摘 要： | 文章在分析滇西北发震构造条件的基础上,把它与鲜水河断裂带进行了对比。滇西北是一个伸展构造区,鲜水河断裂带为一平移剪切带。后者较前者断层面上正应力大、变形强烈、应变速率高。前者断层几何复杂,D?=1.56,后者断层几何简单,D?=1.08-1.2。震源深处变形环境前者者为低压中温,后为高压中温。由此造成地震活动性上的差异
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| 关 键 词： | 发震条件 伸展构造 分数维 剪切断层 |
A COMPARISON BETWEEN XIANSHUIHE FAULT ZONE AND NORTHWEST YUNNAN PROVINCE IN SEISMOGENIC CONDITION |
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| Ma Jin.A COMPARISON BETWEEN XIANSHUIHE FAULT ZONE AND NORTHWEST YUNNAN PROVINCE IN SEISMOGENIC CONDITION[J].Seismology and Geology,1988,10(4):35. |
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| Authors: | Ma Jin |
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| Abstract: | The seismogenic condition of northwest Yunan Province has been analysed and compared with that of Xianshuihe fault zone:1. Xianshuihe fault zone is a shear zone during the movement of Chuan Dian rhombic block, suffering from greater normal stress σn. whlie northwest Yunan is an extensional shear area subjected to smaller normal stress σn.2. The joint action of tectonic driving force and the gravitative creeping force caused intensive deformation with higher strain rate along Xianshuihe fault, while the counteraction led up to a medium deformation with lower strain rate in northwest Yunan3. Depth of Xianshuihe fault downs to 15-30 km and paracyclic stick slip events occurred along the brittle preexisting fault. Depth of faults in northwest Ynuan downs to 20 km on the margin and 5-10 km within the area. The events occurred during extension of the area.4. Xianshuihe fault zone is of simple fault geometry, Df = 1.08-1.2. Northwest Yunan is a complex extensional shear system, Df = 1.56.5. P |
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| Keywords: | Seismogenic condition Extensional structure Fractal dimension Shear fault |
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