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利用山西地震带1970年以来的中小地震目录,计算了该地震带的b值空间分布。在回顾性总结山西地震带构造应力场特征的基础上,分析了其与b值空间分布的关系,并探讨了b值空间分布所反映的构造应力场特征。研究结果显示,山西地震带上震源机制解中T轴方位近似垂直于b值等值线的切线,P轴近似平行于b值等值线的切线,暗示断陷盆地内的低b值状态与断裂的构造特征和活动方式有关。
Based on the catalog of small and medium earthquakes in Shanxi Seismic Belt since 1970, the b value distribution of the seismic belt is calculated. Based on the retrospective analysis of the tectonic stress field in Shanxi Seismic Belt, the relationship between the tectonic stress field and the spatial distribution of b value was analyzed. The tectonic stress field characteristics reflected by the spatial distribution of b value were also discussed. The results show that the azimuth of T-axis in the focal mechanism solution of Shanxi earthquake zone is approximately perpendicular to the tangent of the b value contour, and the P axis is approximately parallel to the tangent of the b value contour, suggesting that the low b value state in the fault basin The tectonic features of the fault are related to the way of activity.