| 滇西北新构造运动时期构造应力场变化特征的探讨 |
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| 引用本文： | 冉勇康,李祥根.滇西北新构造运动时期构造应力场变化特征的探讨[J].西北地震学报,1987,9(3):84-91. |
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| 作者姓名： | 冉勇康 李祥根 |
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| 作者单位： | 国家地震局地质研究所
(冉勇康)，国家地震局地质研究所(李祥根) |
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| 摘 要： | 本文通过对滇西北地区水系分布格局、地质构造及前人研究的地震震源机制解等资料的综合分析对比指出:研究区内,主要是红河断裂带附近及以东地区,新构造时期的应力场经历了由近东西—北西—北北西向的顺时针转变过程。基本上早更新世为北西向;晚更新世中期以前的压应力方向为近东西向;中更新世以来为北北西向。水系分布格局反映的应力场与地质、地震等方面的资料所反映的应力场有较好的一致性,说明利用水系分布来研究本区的应力场是一种可取的方法。
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| 收稿时间： | 1984/2/6 0:00:00 |
THE EVOLUTION OF THE TECTONIC STRESS FIELD IN NORTHWEST YUNNAN DURING NEOTECTONIC PERIOD |
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| Ran Yongkang and Li Xianggen.THE EVOLUTION OF THE TECTONIC STRESS FIELD IN NORTHWEST YUNNAN DURING NEOTECTONIC PERIOD[J].Northwestern Seismological Journal,1987,9(3):84-91. |
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| Authors: | Ran Yongkang and Li Xianggen |
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| Institution: | Institute of Geology, State Seismological Bureau, Beijing, China and Institute of Geology, State Seismological Bureau, Beijing, China |
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| Abstract: | This paper presents a detailed analysis on the pattern of drainage systems and the geological structures along the Red Piver Faults and its eastern adjacent area. Together with the results about the earthquake mechanism proposed by precursors, it is pointed out that the stress field in the studied area has been changed since the neotectonic period.Briefly, before the middle time of the early Pleistocene the compressive stress axis was approximately east-west trending, while in the middle Pleistocene it was northwest-southeast trending. After this, it has turned to northwest north-southeast south trending.The stress field inferred from the pattern of drainage systems is consistent with the stress field obtained from geological analysis and earthquake mechanism data. This shows that the analysis of drainage systems is a useful approach for this type of research in this particular area. |
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