Site seismic response analysis based on the HVSR and VRSR methods

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 303-311.

LI Xiaobo1, 2, SONG Linjun1, 2, XUAN Yutong1, 2, WU Yiwen1, 2, OUYANG Ganglei1, 2

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Abstract

The microtremor data obtained from the strong earthquake stations using the horizontal-to-vertical spectral ratio (HVSR) and velocity response spectral ratio (VRSR) methods were used to investigate the seismic response characteristics of the strong earthquake station sites based on the strong motion of the 2018 Songyuan Ms 5.7 earthquake. The findings indicate the following (1) the MHVR (horizontal-to-vertical spectral ratio of microtremors), EHVR (horizontal-to-vertical spectral ratio of earthquake motions), and VRSR results can all characterize the peak frequency bands of site seismic response. The (first order) peak frequency ranges of Daliba, Dongsanjiazi, Fenghua, and Baodian, which are strong motion station sites, were 0.90 ~ 1.48 Hz, 0.51 ~ 0.89 Hz, 0.47 ~ 0.98 Hz, and 0.66 ~ 1.10 Hz, respectively. (2) Under the same site conditions, the three results of MHVR, EHVR, and VRSR provide significantly different site amplification coefficients, and the MHVR having the smallest amplification coefficient and VRSR having an overall larger amplification coefficient than EHVR. The scope of site amplification coefficients of Daliba, Dongsanjiazi, Fenghua, and Baodian, which are corresponding to (first order) peak frequency, were 2.63 ~ 8.60, 3.21 ~ 8.19, 3.56 ~ 8.41, and 4.14 ~ 7.96, respectively. (3) Compared with MHVR, both EHVR and VRSR can better reflect the high-frequency characteristics of ground motion and have approximately the same variation trend. (4) When compared with EHVR, VRSR provides abundant low-frequency information, but more frequent fluctuations have some bearing on the rapid identification of peak frequencies. This study has an engineering application value and can serve as a reference for seismic site response analysis based on strong seismic records and microtremor data.

Key words

Site / Horizontal-to-vertical spectral ratio / Velocity response spectrum spectral ratio / Predominant frequency / Amplification factor.

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LI Xiaobo1, 2, SONG Linjun1, 2, XUAN Yutong1, 2, WU Yiwen1, 2, OUYANG Ganglei1, 2. Site seismic response analysis based on the HVSR and VRSR methods[J]. Journal of Vibration and Shock, 2023, 42(22): 303-311

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