Hazard-consistent response spectra in the Region of Murcia (Southeast Spain): comparison to earthquake-resistant provisions |
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| Authors: | Jorge M Gaspar-Escribano Belén Benito Julián García-Mayordomo |
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| Institution: | (1) Universidad Politécnica de Madrid, ETSI Topografía, Geodesia y Cartografía, Campus Sur UPM, Ctra. de Valencia, km 7.5, 28031 Madrid, Spain;(2) Laboratorio de Geotecnia, Centro de Estudios y Experimentaciones de Obras Públicas (CEDEX), c/o Alfonso XII 3-5, 28014 Madrid, Spain |
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| Abstract: | Hazard-consistent ground-motion characterisations of three representative sites located in the Region of Murcia (southeast
Spain) are presented. This is the area where the last three damaging events in Spain occurred and there is a significant amount
of data for comparing them with seismic hazard estimates and earthquake-resistant provisions. Results of a probabilistic seismic
hazard analysis are used to derive uniform hazard spectra (UHS) for the 475-year return period, on rock and soil conditions.
Hazard deaggregation shows that the largest hazard contributions are due to small, local events for short-period target motions
and to moderate, more distant events for long-period target motions. For each target motion and site considered, the associated
specific response spectra (SRS) are obtained. It is shown that the combination of two SRS, for short- and long-period ground
motions respectively, provides a good approximation to the UHS at each site. The UHS are compared to design response spectra
contained in current Spanish and European seismic codes for the 475-year return period. For the three sites analysed, only
the Eurocode 8 (EC8) type 2 spectrum captures the basic shape of the UHS (and not the EC8 type 1, as could be expected a priori).
An alternative response spectrum, anchored at short- and long-period accelerations, is tested, providing a close match to
the UHS spectra at the three sites. Results underline the important contribution of the frequent, low-to-moderate earthquakes
that characterize the seismicity of this area to seismic hazard (at the 475-year return period). |
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| Keywords: | Ground-motion Hazard deaggregation Response spectrum Spain Eurocode 8 NCSE-02 |
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