2005年8月5日四川会东—云南会泽间5.3级地震序列初步研究
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摘要
2005年8月5日22时14分41秒,在四川省会东县与云南省会泽县交界一带发生了Ms5.3级地震。据西昌遥测地震台网测定:震中经纬度为26°35′N,103°03′E,震源深度为10千米。分析认为:这是一次前震—主震—余震型的地震序列事件。另外,由于这次地震情况比较复杂,根据周围20多个测震台站记录的P波初动解求解的震源机制解结果,初步认为这次地震的主震有可能是位于震区附近小江断裂带北段巧家—蒙姑断裂、蒙姑—东川断裂西侧北东向淌塘—岩坝断层北西上盘,在近水平的北北西向主压应力挤压作用下,发生了往北东方向逆冲的右旋错动的结果。
An Ms5.3 earthquake occurred at 22:14:41(Bejing Time) om 5 August 2005 in the boundary are a between Huidong county,Sichuan province and Huize county,Yunnan Province.The earthquake epicentre determined by Xichuang Telemetered Network of Seismographic Station are latitude 26°35′ N and longited 103°03′E.The focal depth is 10 kilometer.Our analysis result shows that this event is pre-shock,major-shock and after-shock type.It is a complicated seismic event.According to the focal mechanism solutions based on calculation of the first moving directions of P wave seismographic recordings of more than 20 stations nearby,the active faults caused by the compressing stress with the horizontal NNW direction are the reason of the majou earthquake happening.These active faults anre Qialjia-Menggu and Tantang-Yaiba faults.The motion of these faults is of right lateral.
An Ms5.3 earthquake occurred at 22:14:41(Bejing Time) om 5 August 2005 in the boundary are a between Huidong county,Sichuan province and Huize county,Yunnan Province.The earthquake epicentre determined by Xichuang Telemetered Network of Seismographic Station are latitude 26°35′ N and longited 103°03′E.The focal depth is 10 kilometer.Our analysis result shows that this event is pre-shock,major-shock and after-shock type.It is a complicated seismic event.According to the focal mechanism solutions based on calculation of the first moving directions of P wave seismographic recordings of more than 20 stations nearby,the active faults caused by the compressing stress with the horizontal NNW direction are the reason of the majou earthquake happening.These active faults anre Qialjia-Menggu and Tantang-Yaiba faults.The motion of these faults is of right lateral.
引文
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[3]廖志和.安宁河、则木河带及邻区近年地震活动分析与预测探讨[J].四川地震,2003,(2):32-36.
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[8]云南省地质局区域地质调查队.1981,中国地质图东川幅G-48-ⅩⅣ,中国地质图制印厂.