利用Aki模型对新丰江水库地区尾波Q值的研究

Q Value Research of Coda Wave in Xinfengjiang Reservoir Area Based on Aki Model

选取2013年1月至2014年12月广东地震台网记录到M_L≥2.0的新丰江水库库区及其周边地震的数字地震波资料,利用单次散射的Aki模型,计算得到该区尾波Q值,并拟合Q值对频率的依赖关系。结果表明:与国内其他区域相比,新丰江水库库区Q值较地震频发地区要高,但低于整个广东地区和国内地震少发地区,且Q值对频率依赖性较高。按震中分4区对樟下台拟合尾波Q值与频率的关系研究地质构造体对Q值计算的影响,并很好的解释了樟下、东兴等台Q值偏小的原因。

Based on digital seismic wave data of earthquakes with M_L≥2.0 in Xinfengjiang reservoir area and adjacent region from January, 2013 to December, 2014, which were recorded by Guangdong Seismic Network, the paper calculates the Q values of coda wave and fits the relationship of Q values versus frequency by using the Aki single scatter model. Comparing with other domestic regions, the Q value of Xinfengjiang reservoir area is relatively higher than that of earthquake-prone regions, but it is lower than that of the whole Guangdong region and earthquake low frequency region, and the dependence on frequency is higher. According to different location of the epicenter recorded by Zhangxia station, fitting relationship between Q value and frequency in four areas, the paper studies the influence of geological structure to the calculation of Q value.Meanwhile, it explains well why Q value is smaller in Zhangxia, Dongxing station etc.