| 西南地区现代构造应力场与地震活动性的实验研究 |
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| 引用本文： | 中国科学院地质研究所实验地震研究组.西南地区现代构造应力场与地震活动性的实验研究[J].地质科学,1977,12(2):159-171. |
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| 作者姓名： | 中国科学院地质研究所实验地震研究组 |
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| 摘 要： | 前言西南地区(指云南、四川西部地区)位于我国南北构造带即南北地震带的南段,是地壳运动剧烈、构造形态复杂、地震活动十分频繁的地区。它西临印度洋板块的俯冲带,东濒古老稳定的四川地台和黔桂古陆,岩层遭到十分强烈的挤压,形成了一系列平行于印度洋板块的巨型褶皱带、深大断裂带及弧形山脉。
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AN EXPERIMENTAL STUDY ON THE CURRENT TECTONIC STRESS FIELD AND SEISMICITY OF SOUTHWESTERN CHINA |
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| Model Experiment Group,Institute of Geology,Aeademia Sinica.AN EXPERIMENTAL STUDY ON THE CURRENT TECTONIC STRESS FIELD AND SEISMICITY OF SOUTHWESTERN CHINA[J].Chinese Journal of Geology,1977,12(2):159-171. |
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| Authors: | Model Experiment Group Institute of Geology Aeademia Sinica |
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| Abstract: | Basing on plenty of field data and simulation experiments this paper deals preliminarily with the current tectonic stress field, seismicity and the generation of earthquakes in the Yunnan-West Sichuan region by means of stress analysis.The experiments show that the rotationo-shearing collision of the Indian Plate against the Eurasian Plate is" the main cause of the current tectonic stress field of the region under study. The action of the Indian Plate is expressed in the following two ways: the one is the NB running compressive stress which gradually decreases from the north towards the south; the other is the SBE-ward movement of the "rhombic faulted block" formed by the Xianshuihe Fault, the Honghe Fault and the Anning Fault.From the experiments one may note that the relative movement between the "faulted blocks" exerts its influence on the stress field. The movement pattern of various faulted blocks leads to various modes of stress accumulation as well as various types of regularity of seismicity. Consequently the regularity of the earthquake migrations for this region may be fairly well explained. |
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