[1]QIN Min,LI Danning,ZHANG Huiyuan,et al.Research on Inelastic Attenuation Q-value,Site Response and Source Parameters in Yunnan Yingjiang Region[J].Journal of Seismological Research,2018,41(04):583-593.
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Research on Inelastic Attenuation Q-value,Site Response and Source Parameters in Yunnan Yingjiang Region
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
41
Number of periods:
2018 04
Page number:
583-593
Column:
Public date:
2018-10-20
- Title:
- Research on Inelastic Attenuation Q-value,Site Response and Source Parameters in Yunnan Yingjiang Region
- Keywords:
- Yingjiang earthquake; Q value; station site response; source parameter; stress drop; Yunnan
- CLC:
- P315.33
- DOI:
- -
- Abstract:
- Based on the digital seismic waveform data recorded by 19 fixed and temporary stations around the Yunnan Yingjiang region,we calculated the inelastic attenuation coefficients and site responses by the Atkinson method and Moya method. And through accurate deduction of seismic attenuation and site response in aftershock area,we calculated source parameters of 1 524 ML≥2.0 earthquakes of the Yingjiang MS5.6 and MS6.1 earthquake sequence. The results show that:(1)The relationship between Q-value and frequency is Q(f)=201.1f 0.4454;(2)The site responses of 19 stations obtained by genetic algorithm show the characteristic of obvious low frequency amplification and high frequency attenuation;(3)There is a good linear relation between seismic moments M0(3.16×1011～1.50×1015 N·m)and local magnitude ML. The source rupture radius range between 87 m and 790 m,which have a certain positive correlation with M0; The corner frequency ranges between 1.7 Hz and 15 Hz,which is negatively correlated with M0. The stress drop ranges between 0.01 MPa and 5.16 MPa,and increases with ML,but there is no obvious linear statistical relationship between them;(4)The temporal and spatial evolution process of stress drops of ML3.0～3.5 earthquakes shows that the spatial distribution of the stress drops of MS5.6 and MS6.1 earthquake sequence show obvious difference,which was mainly controlled by their own seismogenic fault. The mean stress drop of MS5.6 earthquake sequence is higher than that of the MS6.1 earthquake sequence,and the stress drop of MS6.1 earthquake sequence in the aftershock concentration zone is lower than that of the later aftershock. The temporal and spatial evolution process of stress drops of MS5.6 earthquake sequence have a certain directive effect on the the MS6.1 earthquake. The most aftershocks of MS6.1 earthquake sequence occurred in the process of stress drop decreasing and slowly turning up,whose epicentres located in the high stress drop area.
- References:
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Last Update:
2018-10-30