Site Response of the Vertical Ground-Motion

Ronnie Kamai, Gilboa Pe'Er

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

In this study we explore, for the first time, the correlation of the vertical site amplification with alternative site-characterization proxies. Specifically, we use both S- and P-wave related proxies, to account for the joint contribution of these wave types within the vertical ground motion. We use surface recordings from large ground-motion databases and supplement the typical site metadata with additional metadata, including P-wave velocity profile and ground-water level (GWL). We find that the most effective predictor for vertical site-response is a combination of VS30, as a first-order proxy for the site-stiffness, together with the depth to ground-water level, which is an independent proxy affecting the P-wave velocity profile. When used together, these two parameters reduce the aleatory variability of ground motions by approximately 0.3 ln units. We further find that the correlation with these proxies greatly depends on magnitude and distance, linking back to the relative contribution of wave-types and its relation to the incidence angle.

Original languageEnglish
Pages (from-to)608-618
Number of pages11
JournalGeotechnical Special Publication
Volume2018-June
Issue numberGSP 291
DOIs
StatePublished - 1 Jan 2018
Event5th Geotechnical Earthquake Engineering and Soil Dynamics Conference: Seismic Hazard Analysis, Earthquake Ground Motions, and Regional-Scale Assessment, GEESDV 2018 - Austin, United States
Duration: 10 Jun 201813 Jun 2018

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