Year: 2024
Type: article
Abstract: In order to obtain the site effects and sedimentary layer distribution in Nanning urban area, background noise observation was carried out in Nanning urban area from mid-2022 to early 2023. Using the ground pulsation observation records of 561 points with a distance of 500m in Nanning urban area, the distribution results of resonance frequency and magnification of site effects were obtained by HVSR method, and the sedimentary layer distribution in Nanning urban area was obtained by using the resonance frequency-sedimentary layer thickness conversion formula. In this work, the resonance frequency and amplification factor are comprehensively considered, and the K value distribution characterizing the damage degree of the site in Nanning Urban Area is obtained. The results show that the resonance frequency of Nanning urban area is 1~10Hz, and most areas are mainly concentrated in 1Hz; the thickness of Sedimentary Layer is smaller as a whole, mostly 10 ~ 40m, and some local areas are thicker, up to 40 ~ 100m; its overall damage degree is low, and very few areas exceed the safe value (K > 20), indicating that it is safe in earthquake disasters. The results are consistent with the surface topography and public borehole data, and can provide a basic reference for the expansion of the whole urban project and disaster prevention and reduction.
Authors: Hongcheng Ma, Boi-Yee Liao
Institution: Krirk University
Language: English
Topic: Seismic Waves and Analysis
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4391520249