1970年通海7.7级大地震强余震触发

地震 ›› 2004, Vol. 24 ›› Issue (2): 38-46.

1970年通海7.7级大地震强余震触发

郝平¹, 傅征祥¹, 田勤俭¹, 刘桂萍², 刘杰¹

1.中国地震局分析预报中心, 北京 100036;
2.中国地震局监测预报司, 北京 100036

出版日期:2004-04-30 发布日期:2021-11-29
作者简介:郝平(1967-), 男, 甘肃天水人, 副研究员, 1993年获硕士学位, 主要从事地震应力触发等方面的研究。
基金资助:
“十五”国家科技攻关项目(2001BA601B02-02-04); 中国-希腊国际地震合作研究项目; 地震科学联合基金项目(103073)

The tress triggering of large aftershocks following the 1970 Tonghai great earthquake (M=7.7)

HAO Ping¹, FU Zheng-xiang¹, TIAN Qin-jian¹, LIU Gui-ping², LIU Jie¹

1. Center for Analysis and Prediction, CSB, Beijing 100036;
2. China Seismological Bureau Beijing 100036, China

Online:2004-04-30 Published:2021-11-29

摘要/Abstract

摘要： 1970年1月5日云南通海发生了M_S7.7地震, 震后发生了多次M_S＞5.0的强余震。文中计算了1970年通海7.7级大地震后, 主震分别在5次强余震破裂面上诱发的库仑破裂应力变化(ΔCFS)。结果表明, 有4次强余震发生在库仑破裂应力增加(ΔCFS＞0)的地区, 增加的范围为10^-2～10^-1 MPa; 有1次强余震按2种震源机制解结果给出的破裂面计算, 得到2种结果, 分别发生在库仑破裂应力变化为正和在库仑破裂应力变化为负的地区。研究结果表明, 主震位错产生的库仑破裂应力变化可能是1970年通海7.7级大地震强余震活动的重要原因。

关键词: 地震触发, 库仑破裂应力, 通海7.7级大地震

Abstract: The Tonghai great earthquake occurred on Jan. 5, 1970 in Yunnan Province. After the main shock, several large aftershocks (M_S>5.0) occurred. Calculations of the change in Coulomb failure stress on aftershock failure plane reveal that 4 events among 5 large aftershocks occurred in areas with ΔCFS>0 (10^-2~10^-1 MPa); There are two contrary results for one aftershock due to two different focal mechanism, this aftershock occurred in areas with ΔCFS>0 and ΔCFS<0. It is concluded that the permanent fault displacement due to the main shock is the main causation of activity of large aftershocks.

Key words: Earthquake triggering, Coulomb failure stress, Tonghai great earthquake

中图分类号:

P315.72

郝平, 傅征祥, 田勤俭, 刘桂萍, 刘杰. 1970年通海7.7级大地震强余震触发[J]. 地震, 2004, 24(2): 38-46.

HAO Ping, FU Zheng-xiang, TIAN Qin-jian, LIU Gui-ping, LIU Jie. The tress triggering of large aftershocks following the 1970 Tonghai great earthquake (M=7.7)[J]. EARTHQUAKE, 2004, 24(2): 38-46.

参考文献

[1] Harris R A. Introduction to special section: Stress triggers, stress shadows, and implications for seismic hazard[J]. J Geophys Res, 1998, 103: 24347-24358.
[2] Stein R S, Barka A A, Dieterich J H. Progressive failure on the North Anatolian fault since 1939 by earthquake stress triggering[J]. Geophys J Int, l997, 128, 594-604.
[3] Reasenberg P A, Simpson R W. Response of regional seismicity to the static stress change produced by the Loma Prieta earthquake[J]. Science, 1992, 255: 1687-1690.
[4] King G C P, Stein R S, Lin J. Static stress changes and the triggering of earthquakes[J]. Bull Seism Soc Amer, 1994, 84: 935-953.
[5] Hardebeck J L, Nazareth J J, Hauksson E. The static stress change triggering model: Constraints from two southern California aftershock sequences[J]. J Geophys Res, 1998, 98: 4461-4472.
[6] Toda S. Stress transferred by the 1995 M_w=6.9 Kobe, Japan, shock: Effect on aftershocks and future earthquake probabilities[J]. J Geophys Res, 1998, 103: 24543-24565.
[7] 刘桂萍, 傅征祥. 1973年炉霍大地震(M_S=7.6)最大余震(M_S=6.3)的库仑破裂应力触发[J]. 中国地震, 2002, 18(2): 175-182.
[8] 万永革, 吴忠良, 周公威, 等.几次复杂地震中不同破裂事件之间的“应力触发”问题[J]. 地震学报, 2000, 22(6): 568-576.
[9] Simpson R W, Reasenberg P A. Earthquake-induced static stress changes on central California faults[A]. In: Simpson R W eds. The Loma Prieta, California Earthquake of October 17, 1989-Tectonic processes and models[C]. U S Geol Surv Prof Pap, 1994. F55-F89.
[10] Stein R S, King G C P, Lin J. Change in failure stress on the southern San Andreas fault system caused by the 1992 magnitude=7.4 Landers earthquake[J]. Science, 258: 1328-1332.
[11] Okada Y. Internal deformation due to shear and tensile faults in a half-space[J]. Bull Seism Soc Amer, 1992, 82: 1018-1040.
[12] 刘祖荫, 皇甫岗, 金志林. 一九七○年通海地震[M]. 北京: 地震出版社, 1999.
[13] 王椿镛, 朱成男, 刘玉权, 等. 用地形变资料测定通海地震的地震断层参数[J]. 地球物理学报, 1978, 21(3): 191-198.
[14] 马宗晋, 傅征祥, 张郢珍, 等. 1966～1976年中国九大地震[M]. 北京: 地震出版社, 1982.
[15] Varga P. Influence of extermal force on the triggering of earthquakes[J]. Earthq Prediction Res, 1985, 1: 191-201.
[16] 马杏垣. 重力作用与构造运动[M]. 北京: 地震出版社, 1989.