Selection of an appropriate bedrock for site amplification studies

Bhavesh Pandey () and Ravi S. Jakka ()
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Bhavesh Pandey: Indian Institute of Technology
Ravi S. Jakka: Indian Institute of Technology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 112, issue 3, No 13, 2167-2195

Abstract: Abstract The selection of half-space or reference sites significantly influences site amplification studies. However, there are no well-defined guidelines in the literature. Generally, a layer with a local shear wave velocity (VS) of more than 760 m/s is considered a bedrock/half-space/reference site. This study attempts to formulate a rationale for selecting bedrock stiffness to be used as a half-space/reference site. For this study, VS,30 (average shear wave velocity of top 30-m soil strata from shear wave velocity measurements) and the site’s fundamental frequency (obtained from horizontal-to-vertical spectral ratio of ambient vibration records) were used as proxies to study the influence of bedrock/half-space and development of a rationale for their selection. This study uses strong-motion data from India’s sixty-two strong-motion stations and a few from Japan (Kik-Net). The results suggest that considering a site with a shear wave velocity of 760 m/s may not be suitable as a half-space/bedrock for most geomorphological conditions. The results also recognize a pattern that can help in the development of a mathematical model for determining the bedrock for a site using VS,30 and its fundamental frequency as a proxy.

Keywords: Site effects; Bedrock stiffness; Strong ground motion; Amplification; Impedance contrast (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-022-05260-8

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