[1]YANG Yayun,WANG Jian,LI Cuiping,et al.Site Response of the Chongqing Seismic Networks Based on the H/V Spectral Ratio Method[J].Journal of Seismological Research,2024,47(04):528-540.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0047
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Site Response of the Chongqing Seismic Networks Based on the H/V Spectral Ratio Method
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
47
Number of periods:
2024 04
Page number:
528-540
Column:
Public date:
2024-08-20
- Title:
- Site Response of the Chongqing Seismic Networks Based on the H/V Spectral Ratio Method
- CLC:
- P315.6
- DOI:
- 10.20015/j.cnki.ISSN1000-0666.2024.0047
- Abstract:
- Using the microseismic noise data recorded by 36 sub-stations of the Chongqing Seismic Networks,the site response of each of these sub-stations is calculated by the method of H/V spectral ratio.According to the form of the site response curves of these sub-stations within the 0.5-20 Hz frequency band,these sub-stations are divided into five categories:stations with flat curves,stations with low-frequency-amplification curves,stations with intermediate-frequency amplification curves,stations with the curves of intermediate-frequency attenuation and high-frequency amplification.By the help of the geological profiles of the borehole strain monitoring at 7 stations,the influence of the shallow geological structure on the site response of the sub-stations is analyzed.results show that the lithological difference and layered structures on the station site have a certain impact on the site response of the seismic stations.Partial low-density media around the stations will cause site amplification effect in low frequency band(0.5-1 Hz),while the site amplification effect of structures with single lithology is not obvious.Comparing the site response curves recorded by 3 reconstructed stations in 2019 and 2021,it is found that the change of the seismometer pillar will have a substantial impact on the site response curves; the independent pillar has obvious site amplification effect.In Chongqing area,the site response contour lines are not necessarily related to the regional terrain and geomorphology,but the small-scale terrain around the station and the location of the station in the mountains will affect the form of the site response curves within the frequency band.In conclusion,the lithology underneath the station,the differences of the shallow media,the construction quality of the seismometer pillar,the regional terrain,and the shallow geological structures all affect the site response at the stations.
- References:
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Last Update:
2024-08-20