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Enhancing Nuclear Safety


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New empirical response spectral attenuation laws for moderate European earthquakes.

CATHERINE BERGE-THIERRY*, FABRICE COTTON*, OONA SCOTTI* D-A. GRIOT-POMNIERA**,  Y. FUKUSHIMA***

Journal of Earthquake Engineering, Vol. 7, No. 2; 193-222

Document type > *Article de revue

Keywords > earthquakes, safety analysis

Research Unit > IRSN/DEI/SARG/BERSSIN

Authors > BERGE-THIERRY Catherine, SCOTTI Oona

Publication Date > 15/09/2003

Summary

  

This paper presents response spectral attenuation laws used in the new French Safety Rule, which is the reference for nuclear safety studies in France. Attenuation laws were derived from 965 horizontal and 485 vertical components from a two-step inversion method and accounts for geometrical spreading, anelastic attenuation and geological site condition. The datasets are mainly constituted of European strong motion records (83%) recently collected and homogeneously processed. In order to complete the distribution data beyond magnitude 6, a few American records were added, representing 17% of the datasets. The magnitude type and source-to-site distance definitions chosen to derive the laws are tested with respect to other definitions. These parametric tests induce a conservative law, for some magnitude and distance ranges of interest. The residual values between observed and predicted spectral accelerations are studied and do not exhibit any bias. The inferred laws are in good agreement with classical strong motion attenuation laws.

Keywords: European strong ground motions; spectral acceleration prediction; seismic hazard; French Safety Rule for Nuclear Power Plants.

* IRSN, Institut de radiooprotection et de sûreté nucléaire, France

**Hémisphères, France

***Shimizu Corporation, Izumi Research Institute, Japan


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