Deterministic seismic hazard computations (hybrid method) applied for two cities in the territory of Hungary

Gribovszki, Katalin Eszter and Franco, Vaccari and Szalai, Sándor and Czirok, Lili and Varga, Péter and Giuliano, F. Panza (2025) Deterministic seismic hazard computations (hybrid method) applied for two cities in the territory of Hungary. In: Reliable Seismic Hazard Assessment and Earthquake Engineering: A New Horizon. Taylor and Francis Group, Boca Raton, pp. 217-232. ISBN 9781041112993

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Abstract

Between 2002 and 2008, K. Gribovszki had the opportunity to stay in Trieste for several months and to participate in the research of the Seismological Group of the Department of Earth Sciences, University of Trieste, using data taken with her from Hungary. In this summary paper, we briefly report the results of the deterministic seismic hazard computations carried out during these years. The primary objective of our work in Trieste was to prepare seismic hazard and risk maps for the cities of Debrecen and Budapest, capital of Hungary. In order to achieve this goal, synthetic seismograms were computed by the so-called hybrid technique by using different earthquake scenarios along several profiles. The response spectra ratio values (RSR) along the investigated 2D profiles (at the predefined set of points) versus frequency and the epicentral distance have been automatically provided by the hybrid technique for the vertical, transversal, and radial components. Similarly to the RSR, curves of ratios of peak ground accelerations (PGA(2D)/PGA(1D)) were automatically provided as well at the predefined set of points at the surface along the investigated profiles. Besides these maps and curves, unique earthquake hazard curves have been produced too, such as Effective Peak Acceleration (EPA) curves for the inner town of the city of Debrecen. EPA curves made it possible to compare our results using our scenario No. 1 to the macroseismological intensity map of a devastating historical earthquake in 1834, thus it was able to validate our computations. As the results of the computations peaked, ground acceleration grid maps for the territory of the downtown of Budapest and Debrecen for the three different components came into existence as well. Furthermore, for both cities, special seismic risk maps have been prepared. These special seismic risk maps were created based on the combination between the maximal amplitude frequencies of spectral acceleration of synthetic seismograms and the building’s eigenfrequencies at every 0,1 km2 or even less areas at the downtown of Budapest and Debrecen.

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