Abstract:We study the attenuation of coda waves and its frequency and lapse-time dependence based on Aki Model in Xiangjiaba and Xiluodu reservoirs region. We analyze coda waves from 99 earthquakes recorded in this region. The magnitudes of the analyzed events range from 2.1 to 4.1. The Qc values show strong frequency dependence, Q(f)=(120.8±3.6)f(0.771 2±0.010 3). Our results provide a good basis for the calculation of seismic source parameters. Compared with Koyna reservoir, Aswan reservoir and Xinfengjiang reservoir, Xiangjiaba and Xiluodu reservoirs are characterized by high Q0 value and low n value, which are consistent with the seismic activity of reservoir areas.