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lgM_0、Mw与M_L具有较好的线性相关性。
In this paper, 31 seismic events of ML 2.7--Me 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, Mw, 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 ,Mw and Mc of the 31 events.
出处
《地震地磁观测与研究》
2011年第6期35-41,共7页
Seismological and Geomagnetic Observation and Research
关键词
观测谱
震源谱
震源参数
矩震级
observed spectra, source spectra, source parameters, Mw
