大庆地区地震精定位与震源机制解分析

依托大庆城市活动断层探测项目,开展大庆区域地震活动性研究。筛选黑龙江省及周边662个地震事件的震相到时,修订研究区域走时模型。对研究区148个地震运用交切法和双差法重新定位,对比发现,双差定位后地震定位精度显著提高,地震空间分布更加集中,条带状更为明显,震源深度表明,研究区孕震层基本位于地壳中上部。利用震源机制解资料,对工作区现代构造应力场进行分析,认为本区域构造应力场主压应力方向为NE向,以水平走滑作用为主。

Analysis of the fine location and focal mechanism solution of the earthquake in Daqing area

Based on Daqing urban activity fault detection project, to carry out Daqing regional seismic activity research. When the seismic records of 662 earthquakes in Heilongjiang Province and the surrounding area were screened, the study area travel time model was revised. The results show that the seismic positioning accuracy is significantly improved after the double differential positioning, the spatial distribution of the earthquake is more concentrated, the strip shape is more obvious, and the depth of the source shows that the seismic potential of the study area is higher than that in the study area. The layer is located in the upper part of the crust. Based on the analysis of the tectonic stress field, the main compressive stress of the tectonic stress field in this area is NE direction, and the horizontal strike-slip effect is the main factor.