【摘要】 利用宁夏及邻区的数字测震资料,选取2009年5月至2010年10月间的31个ML2.7—M_L4.9地震事件的波形记录,以Brune提出的震源谱为平方模型基础,通过消除观测谱中的几何扩散、非弹性衰减、场地响应、仪器响应等影响因素,得到这些地震的震源谱,根据Brune的圆盘震源模型计算并研究地震矩、矩震级、地震应力降、震源尺度等震源参数及关系。结果表明,31个地震的lgM₀、Mw与M_L具有较好的线性相关性。更多还原

【Abstract】 In this paper, 31 seismic events of M_L 2.7—M_L 4.9 in Ningxia region and borders, which occurred from May, 2009 to Oct, 2010 were studied. Based on the source displacement spectrum of the omega-squared mode, removed the effects of instrument, attenuation and site from the observed spectra, we get the source spectra of these earthquakes. According to Brune s model, the source parameters such as the seismic moment M₀,M_w,stress drop △δ and source radius are calculated. We also analyzed the relationship between the source parameters. The result shows that there is a good relation among the lg M₀ ,M_W and M_L of the 31 events.更多还原