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| Typical features of sites in Shanghai based on HVSR method |
| ZHAO Peng1,2, WEI Xiao1,3, HU Jun1,2 |
| 1. Shanghai Earthquake Administration, Shanghai 200062, China;
2. Shanghai Sheshan National Geophysical Observatory, Shanghai 200062, China;
3. Chongqing Earthquake Agency, Chongqing 401147, China |
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Abstract The Shanghai Strong Earthquake Network obtained several strong earthquake records such as the 6.0 magnitude earthquake in Kyushu, Japan, on May 3, 2020. By analyzing and processing the seismic records, the H/V spectral ratio curves of each strong earthquake station are calculated respectively, and the fundamental resonance frequency and sediment thickness of each station are obtained by combining with the distribution map of the buried depth of bedrock of Shanghai Institute of Geological Survey. The results show that: (1) there is an obvious correlation between the peak value of H/V spectral ratio curve and the thickness of the sedimentary layer, and the empirical formula of the thickness of the sedimentary layer and the resonance frequency of the fundamental order in Shanghai is established through data fitting, and the basic period distribution map of the Shanghai market is drawn, which can provide a certain reference for the seismic fortification of Shanghai. (2) There will be multiple peaks in the spectral ratio curve of seismic records on the thick sedimentary layer site, and the second peak represents the higher-order resonance frequency of the sedimentary layer. (3) The empirical formula of shear wave velocity and sediment thickness in Shanghai area is obtained through data fitting.
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Received: 24 July 2023
Published: 15 June 2024
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