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利用地方震尾波估测新丰江库区的Q值
引用本文:梁劳,林美.利用地方震尾波估测新丰江库区的Q值[J].地震学报,1988,10(2):124-136.
作者姓名:梁劳  林美
作者单位:广东省地震局
摘    要: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Q0值,得到Q0值在170——300之间,平均为23038;频率相关系数为0.0——0.2。Q0的平面分布表明,近坝峡谷区具有最低的Q0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。 

关 键 词:新丰江水库区    尾波散射理论    优势频率    尾波形状函数    尾波斜率函数    尾波Q0

Q-VALUE IN XINFENGJIANG RESERVOIR REGION ESTIMATED BY Q OF CODA WAVES OF LOCAL EARTHQUAKES
Affiliation:Seismological Bureau of Guangdong Province
Abstract:Based on Aki's theory on single backscattering coda wave in applying the coda theory model developed by Herrmann et al. while assuming that the Q is interrelated with the frequency, theoretic curves are calculated in the paper, taking the predominant coda frequency fp(t*, ), the coda slope C(fp, t*, ) and the shape S(p, t*, ) as function of t* for the model 58-1, 63-Band DSL-1 short-period seismographs used in the Xinfengjiang region-data were obtainedfrom 55 local earthquakes, with magnitudes mostly between 3.0 and 5.0. By applying both methods of S-t* and C-t* on the seismic data reco ded with model 58-1 seismographs at four seismic stations in the Xinfengjiang region, the Qo-value of the earth's crust at a frequency around 1.0 HZ in the reservoir region is calculated as between 170 and 300, averaging 23038, and the frequency correlation coefficient being 0.0 to 0.2. Spatial distribution of Q0 indicates that the lowest Q0-value falls on the deep canyon area near the dam. Compared with data obtained in other areas, it is considered that the reservoir region is a relatively stable geologic structure.In addition, the methods of estimating the Q-value of coda waves as well as other issues concerned are also discussed in the paper. 
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