Abstract With seismic waveform data from 2001 to 2015 recorded by the Three Gorges digital earthquake network, the inelastic attenuation coefficients in different water impoundment phases are calculated. The well-fitting results suggest that the linear relationship between the Q value and the frequency is significant. In general, the Q0 value and η value at different impoundment stages are similar, and relatively not so large. This indicates that the tectonic structures in the study area are very complex and the frequency of the mirco-small earthquakes is high. In addition, the medium in this region is very heterogeneous. The Q value near the Xiannvshan-Jiuwanxi fault is large, which shows that the region is relatively tectonically stable. While the Q value in Badong region is small, it might denote that tectonic activity is stronger. For the Xietan region, the Q value becomes larger with the water level increasing, showing that the medium becomes more and more homogeneous.
WEI Guichun,ZHANG Lifen,SHEN Xuelin et al. Q Value Analysis of the Key Monitoring Area of Three Gorges Project at Different Water Impoundment Stages[J]. jgg, 2017, 37(6): 651-654.
WEI Guichun,ZHANG Lifen,SHEN Xuelin et al. Q Value Analysis of the Key Monitoring Area of Three Gorges Project at Different Water Impoundment Stages[J]. jgg, 2017, 37(6): 651-654.