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Authors: Köhler, A.*
Ohrnberger, M.*
Scherbaum, F.*
Stange, S.*
Kind, F.*
Title: Ambient vibration measurements in the Southern Rhine Graben close to Basle
Issue Date: 2004
Series/Report no.: 47 (6)
Keywords: H/V ratio
ambient vibration
array analysis
fundamental frequency
Rhine Rift Valley
Abstract: This study presents results of ambient noise measurements from temporary single station and small-scale array deployments in the northeast of Basle. H/V spectral ratios were determined along various profiles crossing the eastern masterfault of the Rhine Rift Valley and the adjacent sedimentary rift fills. The fundamental H/V peak frequencies are decreasing along the profile towards the eastern direction being consistent with the dip of the tertiary sediments within the rift. Using existing empirical relationships between H/V frequency peaks and the depth of the dominant seismic contrast, derived on basis of the ?/4-resonance hypothesis and a power law depth dependence of the S-wave velocity, we obtain thicknesses of the rift fill from about 155 m in the west to 280 m in the east. This is in agreement with previous studies. The array analysis of the ambient noise wavefield yielded a stable dispersion relation consistent with Rayleigh wave propagation velocities. We conclude that a significant amount of surface waves is contained in the observed wavefield. The computed ellipticity for fundamental mode Rayleigh waves for the velocity depth models used for the estimation of the sediment thicknesses is in agreement with the observed H/V spectra over a large frequency band.
Appears in Collections:04.06.06. Surveys, measurements, and monitoring
Annals of Geophysics

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