呼和浩特—包头盆地震源应力场状态分析

为了分析呼和浩特—包头盆地现今应力场状态,基于内蒙古地震台网记录的地震波形资料,运用振幅比方法获取2000—2016年该盆地及周边M_L≥2.7地震的震源机制解,计算其一致性参数,并反演区域应力场。结果表明,震源机制解特征主要表现为走滑特征,一致性参数空间分布处于低值状态,力轴方位基本与该区的应力场背景特征相符,即主压应力方位为北东、张应力方位为北西。

Analysis of source stress field state of Hohhot-Baotou basin

In order to analyze the present stress field state of Hohhot-Baotou basin, basic on seismic waveform data recorded by Inner Mongolia seismic network, the source mechanisms of M_L≥2.7 earthquakes in Hohhot-Baotou basin and surrounding area since the year of 2000 are obtained by amplitude ratio method. Their consistent parameter is also calculated, and the regional stress field is inversed. The results show that, the source mechanisms are unitary strike slip, the space distribution of consistent parameter maintains low value state, and the stress axis direction is similar to the background characteristics of the stress field in this area, the directions of main press stress are north-east and tensile stress are north-west.