摘要
Based on horizontal-component digital seismograms recorded on 6 stations of the Yunnan Regional Digital Network, we inversed the inelastic attenuation in the source region of the Shidian swarm using the Atkinson method and the site responses of the 6 stations 200kin around the Shidian epicenters using the Moya method. The observational seismic waveform data were corrected by removing the propagation, instrument and site effects before the source parameters of the Shidian swarm in 2001 were determined using genetic algorithms. The results are as follows： （ 1 ） There is a linear relation between seismic moment and local magnitude. The seismic moment is between 1×10^12 and 10^14 N·m. The rupture radius of the seismic focus varies from 157m to 973m. The seismic moment and the rupture radius maintain a linear correlation. （2） The corner frequency increases as the seismic moment decreases. Based on the expression between corner frequency and seismic moment using least squares fitting, we can obtain the estimated value of the corner frequency. The time-varying value of the calculated corner frequency minus the estimated corner frequency shows that there were continuous high and low anomalies before the strong aftershocks. （3） The seismic stress drop is in the range of 0.07-1.55MPa. The stress drop seems independent of the local magnitude. The variation of stress drops is high before the occurrence of the strong aftershocks. （4） The depth of aftershocks is mostly in a range from 5kin to 10km, which means that energy release of aftershocks is mainly concentrated in this range of depth.
基于在云南地区性的数字网络的 6 个车站上记录的水平部件的数字震动图，我们 inversed 在用 Atkinson 方法和 6 的地点回答的 Shidian 群的来源区域的无弹性的变细用泥熔岩 method.The 在 Shidian 震中附近驻扎 200km 观察 seistoic 波形数据被移开繁殖改正，在在 2001 的 Shidian 群的来源参数前的仪器和地点效果用 ge 被决定????
基金
the State Science and Technology Programof Tackle Key Problemfor the tenth "Five-Year Plan" of China (2004BA601B01-04-03) and the Youth Fund of Earthquake Administration of Yunnan Province ,China
