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[1]孟令媛,张竹琪,周龙泉,等.祁连—海原断裂带强震库仑应力演化特征研究*[J].地震研究,2016,39(04):553-565.
　MENG Lingyuan,ZHANG Zhuqi,ZHOU Longquan,et al.Research on Cumulative Coulomb Stress Evolution Characteristic of Strong Earthquakes along the Qilian-Haiyuan Fault Zone[J].Journal of Seismological Research,2016,39(04):553-565.
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祁连—海原断裂带强震库仑应力演化特征研究*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
39
期数:
2016年04
页码:
553-565
栏目:
出版日期:
2016-10-30

文章信息/Info

Title:
Research on Cumulative Coulomb Stress Evolution Characteristic of Strong Earthquakes along the Qilian-Haiyuan Fault Zone
作者:
孟令媛1; 张竹琪2; 周龙泉1; 臧 阳1
(1.中国地震台网中心,北京 100045; 2.中国地震局地质研究所 地震动力学国家重点实验室,北京 100029)
Author(s):
MENG Lingyuan1; ZHANG Zhuqi2; ZHOU Longquan1; ZANG Yang1
(1.China Earthquake Networks Center,Beijing 100045,China)(2.State Key Laboratory of Earthquake Dynamics,Institute of Geology,CEA,Beijing 100029,China)
关键词:
祁连—海原断裂带;  粘弹性松弛;  Burgers体;  库仑应力演化
Keywords:
Qilian-Haiyuan Fault Zone;  viscoelastic relaxation;  Burgers model;  cumulative coulomb stress evolution
分类号:
P315.727
DOI:
-
摘要:
研究祁连—海原断裂带及其附近区域自1920年海原MS8.5地震后至今发生的6次MS≥7.0强震间的相互触发关系,基于Burgers体构建粘弹性介质模型,模拟同震和震后库仑应力的演化过程; 进一步针对祁连山北缘断裂带、西秦岭北缘断裂带及六盘山断裂带3条主要断裂带,分别计算自1920年至今6次强震在这3条断裂带上近百年尺度的应力累积。结果表明:1927年古浪MS8.0地震受到1920年海原MS8.5地震同震和震后库仑应力的共同加载,1954年民勤MS7.0地震和1990年共和MS7.0地震均受到之前发生强震的库仑应力的累积加载影响; 西秦岭北缘断裂位于6次强震震后的综合累积应力卸载区,六盘山断裂带则位于累积应力加载区。研究强震间库仑应力演化特征及其对周围断裂带的较长时间尺度的累积影响,需要合理考虑粘弹性松弛效应下的震后库仑应力的累积作用,也可结合地震活动性进一步为明确危险断层段提供合理的参考。
Abstract:
Firstly,we study the triggering relation of six strong MS≥7.0 earthquakes after Haiyuan MS8.5 earthquake in 1920 along the Qilian-Haiyuan Fault Zone and its adjacent area since 1920,such as the 1920 Haiyuan MS8.5 earthquake,the 1927 Gulang MS8.0 earthquake,the 1932 Changma MS7.6 earthquake,the 1954 MS7.3 Shandan earthquake,the 1954 Minqin MS7.0 earthquake,and the 1990 Gonghe MS7.0 earthquake.Secondly,we establish the viscoelastic medium model based on Burgers model to simulate the co-seismic and post-seismic cumulative coulomb stress changes.Finally,we calculated the stress accumulation in the last hundred years of 6 strong earthquakes on the north Qilian-Mountain Fault,the north Western-Qinling Fault and Liupan-Mountain Fault.The results shows that the 1927 Gulang MS8.0 earthquake was triggered by the loading of both co-seismic and post-seismic coulomb failure stresses of the 1920 Haiyuan MS8.5 earthquake,and the 1954 Minqin MS7.0 earthquake and the1990 Gonghe MS7.0 earthquake were both influenced by the loading of cumulative coulomb stress of their previous earthquakes.The north Western-Qinling Fault was located in the stress unloading zone cumulated by the total 6 strong earthquakes with the viscoelastic relaxation till 2015,and the Liupan-Mountain Fault located in the cumulative stress loading zone.It needs to point out that studying the coulomb stress changes of strong earthquakes and their cumulative effect on the surrounding fault zone in the long time scale,it need to consider the cumulative effect of post-seismic coulomb stress under the effect of viscoelastic relaxation and provide reference for determining the risk segment combining with seismic activity.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-06-06
基金项目:中国地震局地震行业科研专项(201508010)、国家自然科学基金(41404045,41304073)、地震科技星火计划(XH15011)和中国地震局监测预报司震情跟踪定向工作任务(2015010103)联合资助.
通讯作者:张竹琪(1980～),副研究员,主要从事地块与断层数值模拟、区域地震活动性及震源机制等方面的研究.E-mail:zhangzq@ies.ac.cn

更新日期/Last Update: 2016-10-30