采用视应力方法跟踪分析和林格尔小震丛集

针对2015年10月29日内蒙古自治区和林格尔出现的小震丛集，以和林格尔地区2010年3月至2015年12月M_L 2.0以上地震为研究对象，利用该时段数字地震波形反演震源参数，采用Brune模式，呈现该地区视应力时空变化特征。结果显示：①和林格尔视应力值相对较低；②和林格尔小震频发区视应力时序变化无明显映震规律；③和林格尔小震丛集视应力与震级出现不同步变化规律。

Analysis on the small earthquake cluster in Helingeer with apparent stress method

Acccording to the earthquake cluster, which appeared in Helingeer, Inner Mongolia autonomous region on October 29, 2015, the earthquakes of M_L 2.0 occurred in Helingeer area during March 2010 to December 2015 are studied. Using the inversion of digital seismic waveform data for source parameters of the time frame, adopting the nearby Brune mode, the spatial and temporal variations of stress in the region are rendered. The results show:①Apparent stress value is relatively low in the studying area; ②The temporal variation of apparent stress in region of small earthquakes occurred frequently has no obvious relationship with earthquake occurrence; ③There is an asynchronous variation rule between the temporal distributions of apparent stress and magnitude of small earthquake cluster in Helingeer.