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新源、和静交界ML6.8级地震序列应力降和震源机制研究
刘建明,王琼,刘杰,邓菲,向元,杨文,李金
作者单位
刘建明 新疆维吾尔自治区地震局, 乌鲁木市新市区科学二街338号 830011 
王琼 新疆维吾尔自治区地震局, 乌鲁木市新市区科学二街338号 830011 
刘杰 中国地震台网中心, 北京 100045 
邓菲 云南省地震局, 昆明 10000 
向元 新疆维吾尔自治区地震局, 乌鲁木市新市区科学二街338号 830011 
杨文 中国地震台网中心, 北京 100045 
李金 新疆维吾尔自治区地震局, 乌鲁木市新市区科学二街338号 830011 
摘要:
采用新疆区域台网记录的2012年6月30日新源、和静交界ML6.8地震序列的数字波形资料,研究分析了余震序列应力降的变化特征及其地震序列震源机制的相关性。首先采用波谱分析方法和Brune震源模型,计算了新源、和静交界ML6.8级地震序列震源参数、地震序列中不同事件在相同台站的体波零频震源谱值、地震谱振幅相关系数;并对地震序列震源机制解进行聚类分组。结果表明:①在余震序列平静阶段,应力降呈平稳态势,强余震前应力降出现升高-回落变化过程;②滑动平均谱振幅相关系数在主震后发散,表明余震的震源机制解与主震的相关性降低;③震源机制解聚类分组结果显示,ML6.8地震序列主要以走滑型地震为主,主压应力轴呈近NS向,与近NS向的构造应力场结果基本一致,一定程度上显示了地震前天山中段受NS向水平挤压应力作用明显;④震级、震源机制演化表明,强余震前震源机制解表现较好的一致性,显示了区域应力场控制作用增强,对后续强余震发生具有预测意义。
关键词:  新源、和静交界ML6.8地震序列  应力降  震源机制相关系数  体波谱振幅  聚类分组
DOI:
分类号:
基金项目:This project was sponsored by the Specific Fund of Fundamental Research, Institute of Geophysics, China Earthquake Administration (DQJB16B19).
Research on Stress Drops and the Focal Mechanisms of the Xinyuan-Hejing ML6.8 Earthquake Sequences
Liu Jianming,Wang Qiong,Liu Jie,Deng Fei,Xiang Yuan,Yang Wen,Li Jin
Abstract:
Based on the digital waveform data recorded by Xinjiang Digital Seismic Network for the Xinyuan-Hejing ML6.8 earthquake sequences of June 30, 2012, this paper analyzes the stress drops of earthquake sequences and the correlation coefficients of focal mechanisms significant for strong aftershocks. Firstly, the source parameters of the Xinyuan-Hejing ML6.8 earthquake sequences are obtained by applying the spectrum analysis and the Brune's source model. Then, the correlation coefficients of spectral amplitudes are calculated using the low-frequency spectral amplitude recorded by the same station for the different events. Finally, based on the results of the correlation coefficients of spectral amplitudes, the events with similar focal mechanisms are grouped using the clustering method. The results show that:(1) The stress drop values show a steady trend in the aftershock sequence calm period and the stress drop values show a rise-fall in strong aftershocks. (2) The moving average correlation coefficient of amplitude spectrum begins to spread after the main shock. It shows that the correlation decreases between the main shock and the aftershocks in mechanisms. (3) The results of focal mechanism groups show that the earthquake sequences are mainly strike slips. The stress distribution of the main pressure axis is nearly NS, which is the same as the structural stress field. (4) The magnitude and mechanism show that there is an agreement before the strong aftershock, which shows that the regional stress field is enhanced.
Key words:  Xinyuan-Hejing ML6.8 earthquake sequences  Stress drop  The correlation of the focal mechanism  Body-wave spectral amplitude  Clustering group