| Study on the Genesis of the Yongsheng Earthquake with Ms6.0 on October 27, 2001 |
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| 作者姓名： | Zhou Guangquan Su Youjin Wang Shaojin |
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| 作者单位： | SeismologicalBureauofYunnanProvince,Kunming650041,China |
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| 基金项目： | ThisprojectwassponsoredbytheNationalScientificandTechnologicalProgramofthe”TenthFive YearPlan” (2 0 0 1BA6 0 1B0 1 0 2 0 2 ) ,China |
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| 摘 要： | On October 27, 2001, a large earthquake with Ms6.0, named the Yongsheng earthquake, occurred along the Jinshajiang segment of Chenghai fault in Yongsheng County, Yuunan Province. It is the largest event to occur along the Chenghai fault in the last 200 years. The seismo-geological survey shows that the seismogenic fault, which is the Jinshajiang segment of Chenghal fault, takes left-lateral strike-slip as its dominant movement pattern. According to differences in vertical motion, motion time, landforms and scales, the Chenhai fault can be divided into eight segments. The Jinshajiang segment has a vertical dislocation rate of 0.4mm/a, far lower than the mean rate of the Chenghai fault, about 2.0 mm/a. It‘ s deduced that the two sides of Jinshajiang segment “stuck“ tightly and hindered the strike-slip of the Chenghai fault. The strong earthquake distribution before this event shows that the Jinshajiang segment was in the seismic gap. The Chenghai fault, as a boundary of tectonic sub-blocks, makes the Northwest Yunnan block and the Middle Yunnan block move clockwise, and their margins move oppositely along the Chenghai fault. In the motion process of the Chenghai fault, structural hindrance and the seismic gap of strong earthquakes are propitious to the concentration and accumulation of structure stress. As a result, the Yongsheng Ms6.0 earthquake occurred. The Sujiazhuang-Shangangfu segment is similar to the Jinshajiang segment with a low vertical motion rate of 0.3 mm/a and in the seismic gap. So it‘s postulated that the segment may become a new structure hindrance, and the Yongsheng Ms6.0 earthquake may trigger the occurrence of future large earthquakes along this segment.
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| 关 键 词： | 震源 地震事件 金沙江 云南 |
Study on the Genesis of the Yongsheng Earthquake with Ms6.0 on October 27,2001 |
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| Zhou Guangquan,Su Youjin,Wang Shaojin.Study on the Genesis of the Yongsheng Earthquake with Ms6.0 on October 27, 2001[J].Earthquake Research in China,2003,17(4):364-375. |
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| Authors: | Zhou Guangquan Su Youjin and Wang Shaojin |
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| Abstract: | On October 27, 2001, a large earthquake with Ms6.0, named the Yongsheng earthquake,occurred along the Jinshajiang segment of Chenghai fault in Yongsheng County, Yunnan Province. It is the largest event to occur along the Chenghai fault in the last 200 years. The seismo-geological survey shows that the seismogenic fault, which is the Jinshajiang segment of Chenghal fault, takes left-lateral strike-slip as its dominant movement pattern. According to differences in vertical motion, motion time, landforms and scales, the Chenhal fault can be divided into eight segments. The Jinshajiang segment has a vertical dislocation rate of 0.4 mm/a, far lower than the mean rate of the Chenghai fault, about 2.0 mm/a. It' s deduced that the two sides of Jinshajiang segment "stuck" tightly and hindered the strike-slip of the Chenghai fault. The strong earthquake distribution before this event shows that the Jinshajiang segment was in the seismic gap. The Chenghai fault, as a boundary of tectonic sub-blocks,makes the Northwest Yunnan block and the Middle Yunnan block move clockwise, and their margins move oppositely along the Chenghal fault. In the motion process of the Chenghai fault, structural hindrance and the seismic gap of strong earthquakes are propitious to the concentration and accumulation of structure stress. As a result, the Yongsheng Ms6.0earthquake occurred.The Sujiazhuang-Shangangfu segment is similar to the Jinshajiang segment with a low vertical motion rate of 0.3 mm/a and in the seismic gap. So it's postulated that the segment may become a new structure hindrance, and the Yongsheng Ms6.0 earthquake may trigger the occurrence of future large earthquakes along this segment. |
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| Keywords: | Block motion Vertical dislocation rate Strong earthquake activity Genesis of the earthquakes Yongsheng M S6 0 earthquake |
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