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本文使用滇西地区 PDR-2数字化地震台网的地震记录和相应的处理程序,对滇西地震试验场洱源、漾濞一带22个地震定位,分别计算了 P 波和 S 波的波谱、对震级1.8≤M_L≤3.0,地震矩19.2≤log M_o≤20.6的地震,给出了该地区有关震源参数的一般估计,得到 log M_o与 M_L 的关系为 log M_o=(1.19±0.06)M_L+(16.91±0.14)与美国地震频度较高的中加州地区的 log M_o 和 M_L 的关系基本一致。而与地震活动频度较低的滇中禄劝地区的结果稍有不同。P 波拐角频率一般都大于 S 波的拐角频率,平均拐角频率比 f_o(p)/f_o(s)≈1.5,应力降为零点几巴到数巴,平均震源破裂半径为200多米,平均震源深度接近7公里。
In this paper, we use the seismic records of PDR-2 digital seismograph network in western Yunnan and the corresponding processing procedures to locate the 22 seismic locations of Eryuan and Yangbi regions in the western Yunnan earthquake field, and calculate the P and S wave spectra respectively. 1.8≤M_L≤3.0 and earthquake moment 19.2≤log M_o≤20.6, the general estimation of source parameters in this area is given. The relationship between log M_o and M_L is log M_o = (1.19 ± 0.06) M_L + (16.91 ± 0.14 ) Is consistent with log M_o and M_L in the Central California region where the U.S. earthquakes frequency is higher. The result is slightly different from the Luzhong-Putian area in Yunnan Province, which has a lower frequency of seismic activity. P-wave corner frequency is generally greater than the S-wave corner frequency, the average corner frequency ratio f_o (p) / f_o (s) ≈ 1.5, the stress drop to zero a few bar to several bar, the average source rupture radius of 200 meters, the average focal depth Nearly 7 kilometers.