Crustal seismic velocity in the Marche region (Central Italy): computation of a minimum 1-D model with seismic station corrections |
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| Authors: | L Scarfì S Imposa R Raffaele A Scaltrito |
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| Institution: | (1) Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95213 Catania, Italy;(2) Dipartimento di Scienze Geologiche, Università di Catania, Corso Italia 57, 95129 Catania, Italy |
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| 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 ≤0.8 s 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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| Keywords: | Minimum 1-D model Near surface heterogeneity Earthquake locations Marche region |
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