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观测应变阶在地震应力触发研究中的应用
引用本文:邱泽华,石耀霖.观测应变阶在地震应力触发研究中的应用[J].地震学报,2004,26(5):481-488.
作者姓名:邱泽华  石耀霖
作者单位:1)中国北京100085中国地震局地壳应力研究所 2)中国北京100039中国科学院研究生院
基金项目:国家自然科学基金,地震科学联合基金,大城市活断层探测项目共同资助
摘    要:对中国钻孔应变台网观测到的昆仑山口西MS8.1大地震的应变阶资料的研究结果表明:① 很多观测值与静力位错理论计算值不符合;② 北方地震较活跃地区的很多台站观测到异常大的应变阶,而南方构造运动较不活跃地区的台站虽然也观测到地震波动,但是应变阶不明显. 由此推断,地震的触发(可能是动态触发)作用对远场的实际地震应变变化具有重要影响. 也就是说,远场的构造活动(可能是断层活动)是否曾被地震触发,可能决定当地的应变场变化的主要特征. 进一步对昌平台1999年3月11日张北地震与1999年11月1日大同地震的观测资料对比分析表明:断裂带的分布情况对实际地震应变变化有直接影响. 这证明观测到的异常大的地震应变阶可能是地震触发了当地的断层活动的表现. 

关 键 词:应力触发&    应变观测&    地震应变阶
文章编号:0253-3782(2004)05-0481-08
修稿时间:2003年3月31日

APPLICATION OF OBSERVED STRAIN STEPS TO THE STUDY OF REMOTE EARTHQUAKE STRESS TRIGGERING
Qiu Zehua , Shi Yaolin Institute of Crustal Dynamics,China Earthquake Administration,Beijing ,China Graduate School of the Chinese Academy of Sciences,Beijing ,China.APPLICATION OF OBSERVED STRAIN STEPS TO THE STUDY OF REMOTE EARTHQUAKE STRESS TRIGGERING[J].Acta Seismologica Sinica,2004,26(5):481-488.
Authors:Qiu Zehua  Shi Yaolin Institute of Crustal Dynamics  China Earthquake Administration  Beijing  China Graduate School of the Chinese Academy of Sciences  Beijing  China
Institution:Qiu Zehua 1,2) Shi Yaolin 2) 1) Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China 2) Graduate School of the Chinese Academy of Sciences,Beijing 100039,China
Abstract:A study of the Kunlun Mountain earthquake of M S=8.1 based on observed coseismic strain steps from the borehole strain monitoring network over China has been carried out with some interesting results. Firstly, many recordings disagree with theoretic calculation using static dislocation model. Secondly, abnormally large strain steps are observed at quite a few stations in the tectonically active east-northern China, while in the relatively inactive east-southern China no obvious steps are recorded. It is inferred that seismic stress triggering may significantly affect remote seismic strain field. In other words, whether remote faulting be seismically triggered or not may determine the pattern of local seismic strain changes. Further comparison study results of March 11, 1999 Zhangbei earthquake and November 1, 1999 Datong earthquake show that the specific pattern of seismic zones has obvious influence on seismic strain changes in the region. This supports the idea that observed abnormal strain steps might be produced by coseismicly stress-triggered local faulting.
Keywords:stress triggering  strain observation  seismic stress step
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