1989年以来大同-阳高3次5级以上地震序列精定位研究

Study on the Precise Location of Three Datong-Yanggao Earthquakes with M≥5 since 1989

通过对大同-阳高震区1989-1999年间发生的3次显著地震序列进行双差精定位,研究发现,重新定位后的震源位置呈NNE和NNW两个条带分布,序列空间位置与地震烈度图大体吻合。结合地震烈度图与前人研究成果,认为3次地震序列分别发生在NNE大王村断裂和NNW团堡断裂上,平均震源深度比山西地震台网定位深度有所加深。

Based on the double-difference precise location of three significant earthquake sequences in the Datong-Yanggao earthquake area during 1989-1999,it is found that the hypocenter after relocation is distributed in two bands of NNE and NNW,and the spatial position of the sequence is basically consistent with the seismic intensity map.Combined with the seismic intensity map and previous research results,it is considered that the three earthquake sequences occurred on NNE Dawangcun fault and NNW Tuanbao fault respectively,and the average focal depth is deeper than the positioning depth of Shanxi seismic network.