【摘要】 为了处理中国台阵项目(ChinaArray)产生的海量数据,本文利用STA/LTA方法进行事件触发检测,利用AIC初动到时修正法检测并修订初动到时.为了检验两种方法联合起来的设置效果,选取了18个地震事件进行分析.为解决误触发问题,统计分析了科学台阵记录的小震功率谱,得出小震的主要频段,从而据此修改滤波器带宽以滤除尽量多的干扰信号,而后进行大量地测试,得到了适合小震事件的STA/LTA窗长.针对小震进行的检测,触发参数设置的比较灵敏,所以对于频率和持续时间与小震相似的信号在测试中都能被检测到.结果表明,利用STA/LTA方法对科学台阵记录的地震事件进行检测,利用AIC方法对其到时进行修正,在所有的试验地震中,检测成功率为99%,初动到时的正确率为96.5%.对于震级在2.0级以下的小震,检测成功率为98%,初动到时的正确率为96%.该研究大大节省了分析时间、提高了工作效率.对于应用科学台阵数据进行地下结构反演、中小地震震源参数研究、各断裂带地震分布等地震学、地球物理学方面的研究具有重要的意义.更多还原

【Abstract】 To process the vast data produced by the Item of CHINA-Array,STA/LTA method was used for detecting onsets of events and AIC method was used to improve the accuracy of the onset time.To see the effect of the association of the two methods,18 events were chosen to be analyzed.To solve the problem of wrong touch off,the Power Spectral Density of the events with low magnitude had been calculated and analyzed,so the main frequency band of the events were gained for us to change the filter to filter more unavailable signals.Then we got the window length of the STA/LTA which fit the events with low magnitude. As to the low magnitude events,the touch off parameters were set to be sensitive,so most signals which have the similar frequency and duration time with low magnitude events could be detected.The results showed that 99%events were detected successfully and the accuracy percentage of the onset time was 96.5% by the using of STA/LTA method to detect onsets of events and AIC method to correct the onset time.For the events whose magnitude is lower than 2.0,98% of them were detected successfully and the accuracy percentage of the onset time was96%.This study decreased the analysis time and improved the efficiency largely.It has significant meaning for the research on the structure inversion,the research on the source mechanism of events with low magnitude,the earthquake distribution in different faults and other researches of seismology and geophysics by the using of CHINA-Array data.更多还原