S wave inelastic attenuation and site effect in the northern Tianshan area

In this paper, according to the relationship of observation spectrum with source spectrum, travel-path attenuation factor and site effect, we use the digital seismic data of moderate-small earthquakes to invert the soft rock site effect and S wave inelastic attenuation under the constraint of site effect, and determine the parameters of path and site. The parameters obtained by this method exclude the topographic effect of seismic stations, and truly reflect the seismic effect of free soft rock sites and the S wave inelastic attenuation in the studied region. The average soft rock site effect is about 1.5 times in the frequency domain of 2-4 Hz and the S wave quality factor is obtained as Qs=278f0.346, which can be directly applied to the stochastic modeling of ground motions in the studied region.

Study on Inelastic Attenuation and Source Parameters of the Shidian Swarm in 2001

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.

Inelastic Attenuation of Seismic Wave and Site Response near the Xiaowan Reservoir

Based on digital seismograms recorded by 11 stations of the Xiaowan Reservoir-induced Earthquake Monitoring Network from May 21,2005 to September 2006,we calculated the inelastic attenuation near Xiaowan reservoir using Atkinson method.We got the relation of Q value to frequency as Q(f)=225.8 f 0.332.Using the Moya method we got the site response of the 11 stations of Xiaowan Network and source parameters of 43 earthquakes.The source parameters were discussed briefly.

Attenuation of S wave in the crust of Ordos massif

We presented attenuation characteristics of S waves in the crust of Ordos massif. Using 487 pieces of digital oscil- lograms of 19 seismic events recorded by 32 seismologic stations located on Ordos massif and its surroundings, we have calculated the parameter of three-segment geometric attenuation and give the relation of inelastic attenuation Q value with frequency in the crust of Ordos massif, site responses of 32 stations, and source parameters of 19 events by the genetic algorithm. The results indicate that Q value (at 1 Hz) of S-wave in the crust of Ordos massif is much larger than that in the geologically active tectonic region. The site responses of the 32 stations in the high-frequency section do not show clear amplification effect except one or two stations, while in the low-frequency section, there is difference among the stations. The logarithmic value of seismic moment and the magnitude ML of 19 seismic events has a very good linear relationship.