Abstract Database

STRONG MOTION ESTIMATION IN COSTA RICA AT SPECIFIC SITES USING SPECTRAL INVERSION METHOD

MEE19705
Nathalie Yoliana CHAVARRÍA ESQUIVEL
Supervisor: Toshiaki YOKOI
Country: Costa Rica
Abstractfulltext

The complex tectonic setting of Costa Rica implies the necessity of a real seismic hazard scenario characterization for lifeline facilities and the country. In this paper, one of the conventional spectral inversion technique is applied to strong ground motion records to separate the site effect, the source spectra and the path effect. To assure the quality of the results, the broadband station JTS000 of IRIS/IDA is also incorporated. Two newly developed consistency checks were established to assure the appropriateness of the input data using the individual site effects and Fourier synthetic spectra. The frequency dependent quality factor  was obtained for the northern and central part of Costa Rica. Also, synthetic amplification spectra for the 2012 Sámara earthquake of Mw 7.6 at specific stations were calculated, showing consistency with the intensity anomaly observed for this earthquake. This new method allows the estimation of acceleration spectra of important seismic events.

 

Keywords: Synthetic acceleration spectra, Q value, Consistency check method