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Authors: Theodulidis, Nikos*
Cultrera, Giovanna*
Tento, Alberto*
Faeh, Donat*
Atakan, Kuvvet*
Bard, Pierre-Yves*
Panou, Areti*
Haghshenas, Ebrahim*
SESAME Team, *
Issue Date: 1-Aug-2004
Keywords: Sesame project, H/V spectral ratio, empirical evaluation
Abstract: In order to empirically evaluate the horizontal-to-vertical (H/V) spectral ratio technique, ambient noise measurements performed in about two hundred sites mainly in Europe where weak or/and strong motion data was recorded. Standard Information Sheets (SIS) and earthquake information data were included in the SESAME [Site EffectS assessment using AMbient Excitations] project database, specially designed to facilitate data selection. All noise recordings were processed with JSESAME software to calculate (H/V) spectral ratio, whereas weak and strong motion earthquake recordings were processed with a similarly standardized procedure. For the latter, (H/V) receiver function for all sites were calculated. Experimental site transfer functions obtained from earthquake recordings were compared with the (H/V) spectral ratios from noise recordings in terms of fundamental frequency, amplification bandwidth and amplification level. Similarities and differences between (H/V) spectral ratio of noise and earthquake recordings are presented and discussed. In addition, a dense grid of noise measurements were performed within urban environment of cities affected by strong earthquake (Greece: Thessaloniki, Kalamata, Italy: Palermo). It seems that the (H/V) spectral ratio may satisfactorily indicate areas favorable to the occurrence of higher damage in urban environment. However, quantitative correlation between (H/V) spectral ratio properties and damage distribution (macroseismic intensity, damage grades) in some cases, is difficult to be established given the complexity of parameters involved.
Appears in Collections:04.06.09. Waves and wave analysis
Conference materials
04.06.11. Seismic risk
04.06.06. Surveys, measurements, and monitoring
04.06.04. Ground motion

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