晋冀鲁豫交界地区震源参数特征

利用晋冀鲁豫交界地区邯郸地震台网记录的地震波形资料，选取2005—2016年M_L≥1.8地震事件，采用Brune震源模型，结合遗传算法得到该区中小地震震源参数，并分析各参数形态特征。研究表明：①晋冀鲁豫交界地区中小地震的地震矩取值范围1.34×10¹¹—2.63×10¹⁵ N·m，震源半径取值范围132—1 044 m，拐角频率f_c取值范围1.25—9.82 Hz，应力降取值范围0.036 4—11.063 1 MPa；②震源参数之间相互关系；③按照震中分区分析不同区域应力降分布特征，河北邯郸、邢台等地及附近地区应力降范围为0 MPa<Δσ≤5 MPa，河南濮阳以及范县和山西黎城等地及附近地区应力降范围为5 MPa <Δσ≤11.063 1 MPa，该区处于高应力背景场状态。

The study of the characteristics of earthquake source parameters in the border area of Shanxi,Hebei Shandong and Henan

Using selected the seismic waveform data of M_L ≥ 1.8 earthquake events in 2005-2016 recorded in Handan region network, where is in the border area of Shanxi-Hebei-Shandong-Henan, the source parameters of medium and small earthquakes in the region are obtained with the Brune model and genetic algorithm, and characteristics of source parameters are analyzed. The study results show that the range of seismic moments of the small and medium-sized earthquakes in the border area of Shanxi-Hebei-Shandong-Henan is 1.34×10¹¹-2.63×10¹⁵ N·m, and the range of the focal radius is 132-1 044 m. The corner frequency is in the range from 1.25 Hz to 9.82 Hz. The range of stress reduction is 0.036 4-11.063 1 MPa. The source parameters are correlated. According the study of the distribution characteristics of stress reduction in different epicenter regions, the stress reduction in Handan and Xingtai, Hebei Province, in the range of 0 MPa < Δσ ≤ 5 MPa, while the stress reductions in Puyang and Fanxian, Henan Province and Licheng, Shanxi Province are in the range of 5 MPa < Δσ ≤ 11.063 1 MPa, where is in the state of high stress background.