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Enhancing Nuclear Safety
Luis Fabián Bonilla, Jamison H. Steidl, Jean-Christophe Gariel and Ralph J. Archuleta
Bulletin of the Seismological Society of America, Vol. 92, No. 8, pp. 3165-3179, December 2002
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*Article de revue
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BONILLA Fabian, GARIEL Jean-Christophe
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The Garner Valley Downhole Array (GVDA) consists of a set of seven downhole strong-motion instruments ranging from 0- to 500-m depth. One of the objectives of this experiment is to estimate site response and study wave propagation as the energy travels from the bedrock underneath the site up through the soil column. The GVDA velocity structure is studied by computing synthetic accelerograms for a small event located at an epicentral distance of 10 km. These synthetics simulate well the data recorded at the borehole stations. In addition, theoretical transfer functions are calculated using the obtained velocity model and compare well with the empirical transfer functions from 54 recorded events. It is also observed that the downgoing wave effect is predominant in the first 87 m and is strongly reduced al depth. Using the velocity structure at GVDA and the transfer function results, it has also been possible to develop a simple method to compute the incident wave field, which is needed in nonlinear site response for instance.
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