| 西藏地区地震类型特征研究 |
| |
| 引用本文： | 高锦瑞,益西拉姆,次吉卓玛,格桑尼玛.西藏地区地震类型特征研究[J].地震地磁观测与研究,2022,43(4):8-14. |
| |
| 作者姓名： | 高锦瑞 益西拉姆 次吉卓玛 格桑尼玛 |
| |
| 作者单位： | 中国拉萨 850000 西藏自治区地震局 |
| |
| 基金项目： | 2021年度震情跟踪定向工作任务(项目编号: 2021010129);中国地震局地震科技星火计划(项目编号: XH21031);地震预测开放基金(项目编号: 2021EFOF01) |
| |
| 摘 要： | 对1970年以来西藏地区139组5级以上地震序列类型进行统计及特征分析，发现西藏地区中强以上地震序列以主—余型和孤立型为主，约占79.1%。随主震震级的增加，主—余型所占比例逐渐增加，孤立型和多震型所占比例减少。绝大多数地震的最大震级余震在主震后3个月内发生。西藏地区多震型地震主要发生西藏中强以上地震活跃时段，因此在西藏及邻区5级以上地震频度较高时需注意多震型地震的发生。从地震序列类型空间分布来看，孤立型地震和主—余型地震大多发生在构造相对单一的地区，而多震型地震则大多发生在构造复杂且存在多组构造交汇的区域。
|
| 关 键 词： | 地震序列类型 最大余震 空间分布特征 震后趋势判定 |
Study on the characteristics of seismic sequence types in Tibet |
| |
| GAO Jinrui,Yixilamu,Cijizhuoma,Gesangnima.Study on the characteristics of seismic sequence types in Tibet[J].Seismological and Geomagnetic Observation and Research,2022,43(4):8-14. |
| |
| Authors: | GAO Jinrui Yixilamu Cijizhuoma Gesangnima |
| |
| Institution: | Earthquake Agency of Tibet Autonomous Region, Lhasa 850000, China |
| |
| Abstract: | Based on the statistics and characteristic analysis of 139 groups of earthquake sequences with M≥5 in Tibet since 1970, it is found that the sequence of moderately strong earthquakes in Tibet is dominated by mainshock-aftershock type and isolated type, accounting for about 79.1% in total. With the increase of the magnitude of the main earthquake, the proportion of the mainshock-aftershock type gradually increases, and the proportion of the isolated type and multiple mainshock type decreases. The largest aftershocks of most earthquakes occur within 3 months. Multiple mainshock sequences in Tibet mainly occur in the active period of earthquakes above medium strong magnitude in Tibet. Therefore, when the frequency of earthquakes with M≥5 in Tibet and its adjacent areas is high, attention should be paid to the occurrence of multiple mainshock sequences. From the perspective of the spatial distribution of earthquake sequence types, isolated earthquakes and mainshock-aftershock sequences mostly occur in areas with relatively single structures, while multiple mainshock sequences mostly occur in areas with complex structures and the intersection of multiple groups of structures. |
| |
| Keywords: | seismic sequence type maximum aftershock spatial distribution characteristics determination of post earthquake trend |
|
| 点击此处可从《地震地磁观测与研究》浏览原始摘要信息 |
| 点击此处可从《地震地磁观测与研究》下载免费的PDF全文 |
