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[1]SHAO Yuanyuan,WANG Yan,ZHENG Yong,et al.Distribution Characteristics of Lg-wave Attenuation and Site Response in Liaoning Area[J].Journal of Seismological Research,2022,45(04):552-559.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0061]

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Distribution Characteristics of Lg-wave Attenuation and Site Response in Liaoning Area

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 04 Page number: 552-559 Column: Public date: 2022-08-20

Title:: Distribution Characteristics of Lg-wave Attenuation and Site Response in Liaoning Area

Author(s):: SHAO Yuanyuan¹; WANG Yan¹; ZHENG Yong²; 3; YANG Shichao¹; QIAN Rui¹; JIA Lihua¹; (1.Liaoning Earthquake Agency,Shenyang 110034,Liaoning,China)(2.Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,Hubei,China)(3.Hubei Key Laboratory of Subsurface Multi-scale Imaging,China University of Geosciences,Wuhan 430074,Hubei,China)

Keywords:: Lg-wave; attenuation parameter; site response; joint inversion; Liaoning area

CLC:: P315.31

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0061

Abstract:: In order to study the effect of the difference of geological structures on Lg-wave attenuation in Liaoning area,we divide the area into three tectonic zones:the Western Liaoning Uplift Region,the Eastern Liaoning Uplift Region,and the Xialiaohe Downwarping Region.Then,we select the waveform data of 308 earthquakes(M_L2.0-5.3)during 2007-2018 recorded by the Liaoning Digital Seismic Network,and use the Spectral Ratio method to conduct a joint inversion in the range of 1-7 Hz to calculate the parameters of Lg-wave attenuation and site response.The results show that the attenuation characteristics of Lg-wave are obviously different in these three tectonic regions,while the frequency-dependent indexes(η)have little difference.The Q(f)of the three components(UD,EW,NS)ranges in 176.29-210.55 in the Western Liaoning Uplift Region,in 75.18-141.81 in the Xialiaohe Downwarping Region,and in 161.95-206.10 in the Eastern Liaoning Uplift Region. Respectively,the frequency-dependent index η ranges from 0.39 to 0.90 in the Western Liaoning Uplift Region,from 0.55 to 0.73 in the Xialiaohe Downwarping Region,and 0.50 to 0.69 in the Eastern Liaoning Uplift Region.In the three regions the seismic-wave attenuation is consistent with the regional geological structure.The amplitude curves of the site response at stations are relatively smooth.The site-response amplitude in the Xialiaohe Downwarping Region is larger than that in the Western Liaoning Uplift Region and that in the Eastern Liaoning Uplift Region.This suggests that in Liaoning area the attenuation characteristics of Lg-wave is closely related to the structure of the shallow sedimentary layers.

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Last Update: 2022-08-01