Uncertainty Analysis of Strong-Motion and Seismic Hazard |
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Authors: | R Sigbjörnsson NN Ambraseys |
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Institution: | (1) Department of Civil and Environmental Engineering, Imperial College of Science, Technology and Medicine, South Kensington Campus, London, SW7 2AZ, UK;(2) Earthquake Engineering Research Centre, University of Iceland, Austurvegur 2a, IS-800 Selfoss, Iceland |
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Abstract: | In this article we present the modelling of uncertainty in strong-motion studies for engineering applications, particularly
for the assessment of earthquake hazard. We examine and quantify the sources of uncertainty in the basic variables involved
in ground motion estimation equations, including those associated with the seismological parameters, which we derive from
a considerable number of strong-motion records. Models derived from regression analysis result in ground motion equations
with uncertain parameters, which are directly related to the selected basic variables thus providing an uncertainty measure
for the derivative variable. These uncertainties are exemplified and quantified. An alternative approach is presented which
is based on theoretical modelling defining a functional relationship on a set of independent basic variables. Uncertainty
in the derivative variable is then readily obtained when the uncertainties of the basic variables have been defined. In order
to simplify the presentation, only the case of shallow strike-slip earthquakes is presented. We conclude that the uncertainty
is approximately the same as given by the residuals typical for regression modelling. This implies that uncertainty in ground
motion modelling cannot be reduced below certain limits, which is in accordance with findings reported in the literature.
Finally we discuss the implications of the presented methodology in hazard analyses, which is sensitive to the truncation
of the internal error term, commonly given as an integral part of ground motion estimation equations. The presented methodology
does not suffer from this shortcoming; it does not require truncation of the error term and yields realistic hazard estimates.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | error analysis ground motion estimation equation hazard assessment regression strong-motion uncertainty uncertainty analysis |
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