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在研究唐山7.8级强震前后区域小震的地震波振动持续时间比τH/τV(即水平分量的振动持续时间与垂直分量的振动持续时间之比)变化的基础上,进一步分析了1962年新丰江水库6.1级地震序列的地震波衰减特征。新丰江水库地震是前震丰富,余震衰减缓慢的主震型序列。双下地震台位于新丰江6.1级主震震中附近,相距不到2公里。使用DS—1型短周期地震仪,熏烟记录。本文分析处理了双下台1961年9月至1963年5月记录到的新丰江K≥8的地震。研究了τH/τV在时间进程上的变化。结果表明:在新丰江6.1级主震与5.3级最大强余震前,地震波振动持续时间比τH/τV分别出现了低值异常时间段。这与我们对唐山7.8级地震的研究结果相一致。而在分析τH/τV与震源深度和震中位置关系时未发现明显的规律。
Based on the change of the seismic wave duration of the small earthquakes in the region before and after the Tangshan M = 7.8 M (subscript S) earthquake than τH / τV (that is, the ratio of the vibration duration of the horizontal component to the vibration duration of the vertical component) Seismic wave attenuation characteristics of the 6.1 magnitude earthquake sequence in. The Xinfengjiang Reservoir earthquake is a series of main shocks with rich forebrain and slow aftershock attenuation. Shuangxia seismic station is located near the Xinfengjiang 6.1 main shock epicenter, less than 2 km apart. Use DS-1 short-period seismograph, fumigation record. This paper analyzes and deals with the earthquakes of Xinfengjiang K≥8 recorded by the double-descent from September 1961 to May 1963. The change of τH / τV in time course was studied. The results show that before the Xinfengjiang M6.3 main shock and the M5.3 maximum strong aftershock, the duration of the seismic wave has a low value anomaly period compared with τH / τV respectively. This is in line with our findings on the MS8.8 Tangshan earthquake. However, no obvious rule was found when analyzing the relationship between τH / τV and focal depth and epicenter.