Abstract
A 1-D velocity model for the Marche region (Central Italy) was computed by inverting P- and S-wave arrival times of local earthquakes. A total of 160 seismic events with a minimum of ten observations, a travel time residual ≤0.8s and an azimuthal gap lower than 180° have been selected. This “minimum 1-D velocity model” is complemented by station corrections, which can be used to take into account possible near-surface velocity heterogeneities beneath each station. Using this new P-wave velocity model and the program HYPOELLIPSE (Lahr 1999), the selected local events were relocated. Earthquake locations in this study are of higher quality with respect to the original ones. The obtained minimum 1-D velocity model can be used to improve the routine earthquake locations and represents a further step towards more detailed seismotectonic studies of the area.
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Acknowledgments
Authors thank the “Rete Sismometrica Marchigiana” staff for supplying data for this study and an anonymous referee for the critical reading of the manuscript and useful suggestions. R. Raffaele benefited from a fellowship of Institut Physique du Globe de Paris. S. Imposa was supported by grants from the University of Catania (PRA-2006).
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Scarfì, L., Imposa, S., Raffaele, R. et al. Crustal seismic velocity in the Marche region (Central Italy): computation of a minimum 1-D model with seismic station corrections. Environ Geol 56, 1115–1121 (2009). https://doi.org/10.1007/s00254-008-1211-6
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DOI: https://doi.org/10.1007/s00254-008-1211-6