欢迎访问《地震》,

地震 ›› 2022, Vol. 42 ›› Issue (2): 33-51.doi: 10.12196/j.issn.1000-3274.2022.02.003

• • 上一篇    下一篇

甘东南及邻区地震密集区与历史强震的关系探讨

文亚猛1,2, 袁道阳1, 张波2,3, 姚赟胜2,3, 冯建刚4   

  1. 1.兰州大学地质科学与矿产资源学院, 甘肃省西部矿产资源重点实验室, 甘肃 兰州 730000;
    2.中国地震局兰州地震研究所, 甘肃 兰州 730000;
    3.甘肃兰州地球物理国家野外科学观测研究站, 甘肃 兰州 730000;
    4.甘肃省地震局, 甘肃 兰州 730000
  • 收稿日期:2021-01-12 修回日期:2022-02-12 出版日期:2022-04-30 发布日期:2023-02-17
  • 通讯作者: 袁道阳, 教授。 E-mail: yuandy@lzu.edu.cn
  • 作者简介:文亚猛(1995-), 男, 山东菏泽人, 在读博士研究生, 主要从事活动构造与地震活动性研究。
  • 基金资助:
    第二次青藏高原综合科学考察研究(2019QZKK0901); 中国地震局地震预测研究所基本科研业务费专项(2019IESLZ03); 国家自然科学基金项目(41572197, 42172227)

Discussion on the Relationship Between Earthquake-Intensive Areas and Historical Strong Earthquakes in Southeastern Gansu and Adjacent Areas

WEN Ya-meng1,2, YUAN Dao-yang1, ZHANG Bo2,3, YAO Yun-sheng2,3, FENG Jian-gang4   

  1. 1. Key Laboratory of Mineral Resources in Western (Gansu Province), School of Earth Sciences, Lanzhou University, Lanzhou 730000, China;
    2. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;
    3. Lanzhou National Geophysics Observation and Research Station, Lanzhou 730000, China;
    4. Gansu Earth Agency, Lanzhou 730000, China
  • Received:2021-01-12 Revised:2022-02-12 Online:2022-04-30 Published:2023-02-17

摘要: 甘东南及邻区活动断裂发育、 新活动性强, 历史及现代强震频发, 是探讨现代地震密集区与历史强震关联性的理想地区, 也是发展和检验网格点密集值法及其适用条件的有利地区。 本文选取介于西秦岭北缘断裂带与东昆仑断裂带东段之间, 以走滑活动为主的甘东南及邻区为主要研究区域, 采用网格点密集值法对该区1970年以来仪器记录的1~5级地震进行计算分析, 划分出16个地震密集区。 通过分析每个地震密集区内地震活动的时空分布特征, 判断地震密集区与历史强震之间的对应关系, 归纳总结不同震级历史强震对应地震密集区的持续时间, 同时给出运用网格点密集值方法校核甘东南及邻区历史强震的限定条件。 研究结果表明, 约87.5%的地震密集区对应着历史强震, 表明二者之间有较密切的关联性; 而且地震震级越大, 其对应地震密集区持续时间越长, 二者之间的边界曲线拟合关系为: T=4.5×10-7×(M-0.1)11.15

关键词: 甘东南及邻区, 历史强震, 地震密集区, 离逝时间, 网格点密集值法

Abstract: The southeast Gansu and adjacent areas have developed active faults, strong new activity, and frequent historical and modern strong earthquakes. It is an ideal area to explore the correlation between the modern medium-small earthquake-intensive areas and historical strong earthquakes. It is also an ideal area for testing and developing grid point dense value methods and their application. This paper selects the Southeast Gansu and neighboring areas between the West-Qinling fault and the eastern section of the Kunlun fault, and is dominated by strike-slip activities as the study area. The method of density at grid notes is used to calculate the instrument records of this area since 1970. Calculated and analyzed the magnitude 1-5 earthquakes and divided 16 earthquake-intensive areas. By analyzing the time distribution characteristics of seismic activity in each earthquake-intensive area, the corresponding relationship between the earthquake-intensive area and the historical strong earthquake is judged, and the duration of the historical strong earthquake-intensive area of different magnitudes is summarized, and the use of grid points is given. The restricted condition of the method is given to correct the historical earthquake records in southeast Gansu and neighbouring areas. The research results show that about 87.5% of historical strong earthquakes are located in the corresponding dense area, indicating that there is a closer correlation between the two; the larger the magnitude, the longer the duration of the dense area. The earthquake elapsed time formula is T=4.5×10-7×(M-0.1)11.15.

Key words: Southeast Gansu and neighboring areas, Historical strong earthquake, Earthquake-intensive area, Elapsed time, Method of density at grid nodes

中图分类号: