丽江7.0级大震发震机制新见
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摘要
通过对丽江地区构造格架和丽江大震的震后调查 ,对丽江地震的发震环境进行了系统分析 ,认为丽江地震是在主压应力为近NS向区域应力场作用下 ,NE向丽江 小金河断裂左旋错动和NW向中甸 永胜断裂右旋错动 ,从而导致巨甸—九子海三角形断块东部近尖端部位出现局部拉张环境 ,最终导致近NS向西倾的玉龙雪山东麓断层北端撕裂而发震 .
Based on the study of the regional tectonic framework and investigations of the Lijiang M S7.0 earthquake in 1996,the earthquake generating environments are systematically analyzed.Under the action of potential regional nearly NS compressive stress field,the sinistral slip of the NE strike Lijiang Xiaojinhe fracture and right lateral slip of NW strike Zhongdian Yongsheng fracture resulted in local and extension environment in the eastern triangle end of Yulongxueshan Jiuzihai faulted block, at last the north end of the nearly NS strike and dipping westwards Yulongxueshan's east piedmont fault was ripped up and the Lijiang M S7.0 earthquake happened.
Based on the study of the regional tectonic framework and investigations of the Lijiang M S7.0 earthquake in 1996,the earthquake generating environments are systematically analyzed.Under the action of potential regional nearly NS compressive stress field,the sinistral slip of the NE strike Lijiang Xiaojinhe fracture and right lateral slip of NW strike Zhongdian Yongsheng fracture resulted in local and extension environment in the eastern triangle end of Yulongxueshan Jiuzihai faulted block, at last the north end of the nearly NS strike and dipping westwards Yulongxueshan's east piedmont fault was ripped up and the Lijiang M S7.0 earthquake happened.
引文
[1] 王绍晋 ,龙晓帆 ,罗淑进 .丽江地震序列的震源机制、发震应力场和破裂特征 [J].地震研究 ,1997,2 0 (1) :2 6— 34 .
[2 ] 秦嘉政 ,刘祖荫 ,张俊伟 .用地震标定律研究丽江 7.0级地震的破裂过程 [J].地震研究 ,1997,2 0 (1) :47— 5 7.
[3] 韩新民 ,周瑞琦 .丽江 7.0级地震的烈度分布 [J].地震研究 ,1997,2 0 (1) :35— 46 .
[4 ] 张建国 ,周瑞琦 ,吴伯黔 ,等 .丽江 7.0级地震地表破裂与变形特征 [J].地震研究 ,1997,2 0 (1) :5 8— 5 6 .
[2 ] 秦嘉政 ,刘祖荫 ,张俊伟 .用地震标定律研究丽江 7.0级地震的破裂过程 [J].地震研究 ,1997,2 0 (1) :47— 5 7.
[3] 韩新民 ,周瑞琦 .丽江 7.0级地震的烈度分布 [J].地震研究 ,1997,2 0 (1) :35— 46 .
[4 ] 张建国 ,周瑞琦 ,吴伯黔 ,等 .丽江 7.0级地震地表破裂与变形特征 [J].地震研究 ,1997,2 0 (1) :5 8— 5 6 .
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