Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
© Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
10 Apr 2014
Review status
This discussion paper has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The revised manuscript was not accepted.
Integration of HVSR measures and stratigraphic constraints for seismic microzonation studies: the case of Oliveri (ME)
P. Di Stefano, D. Luzio, P. Renda, R. Martorana, P. Capizzi, A. D'Alessandro, N. Messina, G. Napoli, S. Todaro, and G. Zarcone Dipartimento di Scienze della Terra e del Mare – DiSTeM, University of Palermo, Italy
Abstract. Because of its high seismic hazard the urban area of Oliveri has been subject of first level seismic microzonation. The town develops on a large coastal plain made of mixed fluvial/marine sediments, overlapping a complexly deformed substrate. In order to identify points on the area probably suffering relevant site effects and define a preliminary Vs subsurface model for the first level of microzonation, we performed 23 HVSR measurements. A clustering technique of continuous signals has been used to optimize the calculation of the HVSR curves. 42 reliable peaks of the H/V spectra in the frequency range 0.6–10 Hz have been identified. A second clustering technique has been applied to the set of 42 vectors, containing Cartesian coordinates, central frequency and amplitude of each peak to identify subsets which can be attributed to continuous spatial phenomena. The algorithm has identified three main clusters that cover significant parts of the territory of Oliveri. The HVSR data inversion has been constrained by stratigraphic data of a borehole. To map the trend of the roof of the seismic bedrock, from the complete set of model parameters only the depth of the seismic interface that generates peaks fitting those belonging to two clusters characterized by lower frequency has been extracted.

The reconstructed trend of the top of the seismic bedrock highlight its deepening below the mouth of the Elicona Torrent, thus suggesting the possible presence of a buried paleo-valley.

Citation: Di Stefano, P., Luzio, D., Renda, P., Martorana, R., Capizzi, P., D'Alessandro, A., Messina, N., Napoli, G., Todaro, S., and Zarcone, G.: Integration of HVSR measures and stratigraphic constraints for seismic microzonation studies: the case of Oliveri (ME), Nat. Hazards Earth Syst. Sci. Discuss., 2, 2597-2637, doi:10.5194/nhessd-2-2597-2014, 2014.
P. Di Stefano et al.
P. Di Stefano et al.


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