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根据重庆市地震台网和流动地震台网记录到的天然地震资料,利用接收函数反演得到荣昌地区的精细一维速度结构。在此基础上用双差定位法对2010年9月10日重庆荣昌M_L5.1地震序列进行了精定位。结果表明,地震定位精度得到极大提高,震中分布与区域地质构造的关系更加清晰。多数地震集中在主要断层附近并呈条带状分布,震源深度集中在2km附近,与主要储藏层及注水井深度吻合,初步认为该地震序列为注水活动所诱发的构造地震活动。文中获得的精准的速度结构及地震空间分布对于进一步深入研究震区深部地质构造特征、注水诱发地震的机理等具有重要意义。
According to the natural seismic data recorded by Chongqing Seismological Network and the Mobile Seismic Network, the fine one-dimensional velocity structure in Rongchang area was obtained by using the receiver function inversion. On this basis, the dual-difference method was used to locate the sequence of Rongchang M_L5.1 earthquake on September 10, 2010 in Chongqing. The results show that the accuracy of the earthquake location is greatly improved, and the relationship between epicentral distribution and regional geological structure is more clear. Most of the earthquakes are concentrated in the vicinity of the main fault and are distributed in the form of stripes. The focal depth of the earthquakes is concentrated near 2km, which is consistent with the depth of the main reservoirs and injection wells. It is preliminarily considered that the earthquake sequence is tectonic-seismic activity induced by water-injection. The precise velocity structure and the spatial distribution of the earthquake obtained in this paper are of great significance to further study the features of the deep geological structure in the earthquake area and the mechanism of water-induced earthquake.