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本文根据AKi单次逆向散射的尾波理论,应用Herrmann等人推广了的尾波理论模式,并假设Q与频率相关,计算了58-1,63-B和DSL-1三种短周期地震仪的尾波优势频率、尾波形状和尾波斜率作为t~*函数的理论曲线,并利用库区四个台58-1仪器记录的新丰江库区的地震资料,用S-t~*和C-t~*两种方法,估算了新丰江水库区频率约为1.0Hz短周期波的地壳Q_0值,得到Q_0值在170—300之间,平均为230±38;频率相关系数为0.0—0.2。Q_0的平面分布表明,近坝峡谷区具有最低的Q_0值。与其他地区对比后认为,库区属于地质构造相对稳定的地区。 文中还对尾波Q值的估测方法等若干问题进行了讨论。
According to the coda wave theory of AKi’s single backscatter, we apply the coda wave theory mode extended by Herrmann et al. Assuming that Q is related to the frequency, three types of short-period seismometers, 58-1, 63-B and DSL-1, are calculated The coda wave frequency, the coda wave shape and the coda wave slope are taken as the theoretical curves of t ~ * function. Using the seismic data of Xinfengjiang reservoir recorded by four stations 58-1 in the reservoir area, ~ * Two methods are used to estimate the crustal Q_0 value of the short-period wave with a frequency of about 1.0Hz in Xinfengjiang Reservoir Area. The Q_0 value is between 170 and 300 with an average of 230 ± 38 and the frequency correlation coefficient is 0.0-0.2. The plane distribution of Q_0 shows that the near dam canyon has the lowest Q_0 value. After comparing with other areas, it is considered that the reservoir area belongs to the area with relatively stable geological structure. The paper also discusses some methods of estimating the coda Q value.