| 2001年10月27日永胜6.0级地震的成因探讨 |
| |
| 引用本文： | 周光全,苏有锦,王绍晋.2001年10月27日永胜6.0级地震的成因探讨[J].中国地震,2003,19(2):166-174. |
| |
| 作者姓名： | 周光全 苏有锦 王绍晋 |
| |
| 作者单位： | 云南省地震局,昆明,650041 |
| |
| 基金项目： | “十五”国家科技攻关项目 2 0 0 1BA6 0 1B0 1- 0 2- 0 2 |
| |
| 摘 要： | 2001年10月27日云南永胜发生6．0级地震，笔者先后参加了地震现场灾害损失评估和震后野外科学考察。考察表明，这次地震发生在程海断裂金沙江段上，断裂以左旋走滑活动为主。程海断裂分为8段，各段的垂直差异运动不均匀，金沙江段中更新世以来的垂直位错速率为0．4mm/a，远远低于程海断裂的垂直位错平均速率(2．0mm／a)，从而使金沙江段成为断裂左旋走滑活动的构造障碍段。永胜6．0级地震之前，金沙江段处于程海断裂带上强震活动的“空段”内。程海断裂控制下的次级块体——滇西北块体与滇中块体的边界沿程海断裂作相向运动。在此运动过程中，程海断裂有全线贯通无阻的趋势，构造障碍段和强震活动的围空段有利于构造应力集中、积累，从而孕育和发生了永胜6．0级地震。苏家庄—山岗辅段垂直位错速率仅为0．3mm/a，同时也处于强震活动的围空段内，在程海断裂的贯通过程中成为新的构造障碍段，极有可能成为未来M≥6．0地震的危险地段。
|
| 关 键 词： | 永胜 地震 成因 构造块体 运动特征 垂直位错速率 |
| 文章编号： | 1001-4683(2003)02-0166-08 |
Study on the Cause of the Yongsheng Earthquake with M6.0 on Oct.27,2001 |
| |
| Zhou Guangquan Su Youjin,Wang Shaojin.Study on the Cause of the Yongsheng Earthquake with M6.0 on Oct.27,2001[J].Earthquake Research in China,2003,19(2):166-174. |
| |
| Authors: | Zhou Guangquan Su Youjin Wang Shaojin |
| |
| Abstract: | On October 27,2001,a large earthquake with M 6 0,named as the Yongsheng earthquake,occurred on the Jinshajiang segment of the Chenghai fault,Yongsheng county,Yunnan Province.It is the largest event occurred on the Chenghai fault for the last 200 years.The field seismogeological survey shows that the seismogenic fault,which is the Jinshajiang segment of the Chenghai fault,takes left lateral strike slip as dominant.According to the differences of 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 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 the Jinshajiang segment sticked tightly and hindered the strike slip of the Chenghai fault.The strong earthquake distribution before this event showed that the Jinshajiang segment was in the seismic gap.The Chenghai fault,as a boundary of tectonic sub blocks,makes the Northwestern Yunnan block and Middle Yunnan block move clockwise,and their margins move oppositely along the Chenghai fault.In the motion process of the Chenghai fault,structure hindrance and the seismic gap of strong earthquake are propitious to the concentration and accumulation of structure stress.As a result,the Yongsheng M 6 0 earthquake occurred. The Sujiazhuang Shangangfu segment along the Chenghai fault is similar to the Jinshajiang segment with 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 M 6 0 earthquake may trigger the occurrence of future large earthquake along this segment. |
| |
| Keywords: | Block motion Vertical dislocation rate Strong earthquake activity The cause of the earthquake\ Yongsheng M6 0 earthquake |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
