NDLI: Site effect assessment using KiK-net data: Part 1. A simple correction procedure for surface/downhole spectral ratios

Content Provider	Springer Nature Link
Author	Héloïse, Cadet Bard, Pierre Yves Rodriguez Marek, Adrian
Copyright Year	2011
Abstract	When data is available, the estimation of site effects is usually performed using the “standard spectral ratio” (SSR) technique with respect to an outcropping, reference rock site. This study uses the Japanese KiK-net network, which has more than 600 pairs of surface-downhole stations allowing the computation of empirical borehole transfer functions, consisting of mean spectral ratios of surface over downhole recordings. The borehole transfer function deviates from the SSR in two respects: the reference is located at depth, and the downhole velocity varies from one site to another. These differences bias the estimation of the transfer function with reference to a standard outcrop rock site. The goal of this paper is to develop a simple and robust methodology to correct for such bias. The proposed correction procedure consists of two steps: a depth correction designed to account, in a simplified and physically acceptable way, for the existence at depth of destructive interferences and the absence of free-surface effects in the high-frequency range; and an impedance correction designed to normalize the shear wave velocity at depth. The depth correction involves a simple, frequency-dependent curve to be adapted for each site as a function of the first destructive interference frequency at depth. The impedance normalization combines the use of “generic” rock velocity profiles and a quarter-wavelength approach, resulting in a smooth frequency-dependent amplitude correction. The proposed methodology is applied on a large subset of KiK-net data in view of analysing the correlation between site amplification factors and site parameters in a companion paper.
Starting Page	421
Ending Page	448
Page Count	28
File Format	PDF
ISSN	1570761X
Journal	Bulletin of Earthquake Engineering
Volume Number	10
Issue Number	2
e-ISSN	15731456
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-05-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Site effects Borehole transfer function Depth effects correction Impedance effects normalization KiK-net Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Hydrogeology Environmental Engineering/Biotechnology Structural Geology Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Building and Construction Geophysics Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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