龙门山断裂带最新地震活动特征及其意义

刘小梅, 吴晶, 梁春涛, 钱旗伟, 杜培笑. 2019. 龙门山断裂带最新地震活动特征及其意义. 地球物理学报, 62(4): 1312-1322, doi: 10.6038/cjg2019M0283
引用本文: 刘小梅, 吴晶, 梁春涛, 钱旗伟, 杜培笑. 2019. 龙门山断裂带最新地震活动特征及其意义. 地球物理学报, 62(4): 1312-1322, doi: 10.6038/cjg2019M0283
LIU XiaoMei, WU Jing, LIANG ChunTao, QIAN QiWei, DU PeiXiao. 2019. The latest seismicity characteristics and significance in Longmenshan Fault Zone. Chinese Journal of Geophysics (in Chinese), 62(4): 1312-1322, doi: 10.6038/cjg2019M0283
Citation: LIU XiaoMei, WU Jing, LIANG ChunTao, QIAN QiWei, DU PeiXiao. 2019. The latest seismicity characteristics and significance in Longmenshan Fault Zone. Chinese Journal of Geophysics (in Chinese), 62(4): 1312-1322, doi: 10.6038/cjg2019M0283

龙门山断裂带最新地震活动特征及其意义

  • 基金项目:

    国家重点研发计划(2017YFC1500302),国家自然科学基金(41574055,41674059),岩石圈演化国家重点实验室自主研究课题(11731210)联合资助

详细信息
    作者简介:

    刘小梅, 女, 1992年生, 硕士研究生, 主要从事地震精定位工作.E-mail:liuxiaomei@mail.iggcas.ac.cn

    通讯作者: 吴晶, 女, 1977年生, 副研究员, 主要从事地震各向异性、断裂带结构与震源研究.E-mail:wujing_js@mail.iggcas.ac.cn
  • 中图分类号: P315

The latest seismicity characteristics and significance in Longmenshan Fault Zone

More Information
  • 综合最新布设的龙门山断裂带地震空段台阵(LmsSGA)与四川省地震局固定地震台网数据,对龙门山断裂带新近一年(2016年11月21日到2017年10月28日)的23479个地震事件开展双差定位工作,共获取包括汶川地震余震和芦山地震余震在内的6111个重定位地震事件.在此基础上,分别与汶川地震和芦山地震的早期余震空间分布特征进行比较.研究发现在汶川地震发生近十年后,其余震活动依旧活跃.汶川地震现今余震活动主要分布在10~25 km的深度区间,震源深度呈现西南段较东北段偏深的特征.此外,汶川近年余震分布相比早期余震偏深,破裂带西南段的余震活动有向深部迁移的趋势.对于芦山地震,其近期余震活动较弱,余震主要分布在10~15 km的深度区间,比早期余震的分布区间偏浅.龙门山断裂带最新余震活动分布特征表明,余震活动随着时间的推移有迁移的现象.考虑到距离主震事件已分别有5~10年的流逝时间,余震迁移现象可能由以流体扩散方式为主的准静态应力机制触发.

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  • 图 1 

    研究区域地质构造、断层及LmsSGA台站分布

    Figure 1. 

    Tectonic structures, faults and stations in study area

    图 2 

    LmsSGA数据预处理流程图

    Figure 2. 

    Flowchart of data preprocessing from LmsSGA

    图 3 

    PSIRpicker震相自动识别与人工震相检验校正的波形示例

    Figure 3. 

    Three-component waveform after automatic phase picking and manual checking

    图 4 

    重定位前(a)、后(b)的震中位置分布图

    Figure 4. 

    Seismicity locations before (a) and after (b) relocation

    图 5 

    汶川余震活动沿断裂带走向投影图

    Figure 5. 

    The along-strike projections of Wenchuan aftershocks

    图 6 

    芦山余震活动沿断裂带走向投影图

    Figure 6. 

    The along-strike projections of Lushan aftershocks

    图 7 

    汶川地震与芦山地震最新余震分布

    Figure 7. 

    Distribution of the most recent aftershocks of Wenchuan and Lushan earthquakes

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出版历程
收稿日期:  2018-05-11
修回日期:  2019-02-20
上线日期:  2019-04-05

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