【摘要】 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。更多还原

【Abstract】 In this paper, using earthquake recordings from PDR- 2 digital seismic network in Western Yunnan and the corresponding processing programme, 22earthquakes occurred around Eryuan-Yangbi area in Western Yunnan Test Sitehave been located with respective calculation of P and S spectra. For earthquakes of 1.8≤M1≤3.0 and 19.2≤log M0≤20.6 in the area, the relative source parameters have been generally evaluated. The relationship between log M0 and M1 is obtained as log M0=(1.19±0.06) M1+(16.91±0.14), which is consistent with that in seismically active Central California, U. S. A. But the result is slightly different from that in less active Luquan area, Central Yunnan. In general, P corner frequency is larger than S corner frequency, with an average ratio f0(P)/f0(S)≈1.5, a stress drop of several decimal bars to several bars, an average fracturing radius of 200 m and more, and an average focal depth approximate to 7 km,更多还原