Uniform hazard spectra in western Balkan Peninsula: Fid-Bau Portal

Uniform hazard spectra in western Balkan Peninsula

Lee, Vincent / Herak, Marijan / Herak, Davorka / Trifunac, Mihailo

Abstract Earthquake design codes, which are based on the performance-based design principles, aim to satisfy both the operational continuity and safety requirements for the designed structures. This calls for the design for at least two very different levels of strong earthquake shaking, and thus requires the amplitudes and the shapes of the elastic acceleration spectra to vary with geographic coordinates, and with the probabilities of exceedance. The traditional code procedures, which scale the design spectra in terms of peak ground acceleration and fixed shape spectra cannot meet these objectives. In this paper we show how the performance based design principles can be satisfied if the Uniform Hazard Spectral (UHS) method is used for scaling the design spectra. We illustrate this method for seismic zoning of the northwestern segment of the Bosnia and Herzegovina area, centered at Banja Luka in the Republic of Srpska. The method we present in this paper can be implemented in essentially all seismic regions of the world.

Highlights • Uniform Hazard Spectra of strong earthquake ground motion. • Geographic variations of seismic hazard in the western Bosnia and Herzegovina. • Seismic hazard model for distributed line sources with preferred azimuth. • Advantages of UHS method for performance based seismic design.