【摘要】 从2004-12-26苏门答腊(Mw=9.3)大地震发生后,在该区域诱发的137个地震的波形记录中提取出了清晰的T波,并分析研究了T波波形特征与地震震源参数的相关性.通过分析计算得到如下结论:(Ⅰ)对于同一震级的地震,走滑型地震在海水声纳层中激发的T波能量大于正逆断层型地震;(Ⅱ)随着深度的增加,激发的T波与P波能量的比值(T/P)在逐渐减小;(Ⅲ)T与P,S波峰值到时差与地震震中距呈现较好的线性关系;(Ⅳ)在纬度1.0至2.5的区域,存在一个地震波向声波转换效率高的区域.更多还原

【Abstract】 A total number of 137 earthquakes that occurred after the Big Sumatra earthquake(2004-12-26,Mw=9.3)in the area of Sumatra were used to investigate the relationship between T-wave acoustic energy and the earthquake fault parameters.Computation and investigation results show that:(Ⅰ)for those earthquakes of a common given magnitude,T-wave energy produced by normal and reverse fault is lower than that of strike-slip events;(Ⅱ)T-wave energy decreases with the increase in earthquake depth;(Ⅲ)there is a good linear relationship between the travel time difference and the epicentral distance;(Ⅳ)a high efficient T-wave conversion area exists in the latitude range from 1.0 degree to 2.5 degree.更多还原