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An improved 1-D seismic velocity model for seismological studies in the Campania-Lucania region (Southern Italy)

Abstract : We present a 1-D velocity model of the Earth's crust in Campania-Lucania region obtained by solving the coupled hypocentre-velocity inverse problem for 1312 local earthquakes recorded at a dense regional network. The model is constructed using the VELEST program, which calculates 1-D `minimum' velocity model from body wave traveltimes, together with station corrections, which account for deviations from the simple 1-D structure.

The spatial distribution of station corrections correlates with the P-wave velocity variations of a preliminary 3-D crustal velocity model that has been obtained from the tomographic inversion of the same data set of P traveltimes. We found that station corrections reflect not only inhomogeneous near-surface structures, but also larger-scale geological features associated to the transition between carbonate platform outcrops at Southwest and Miocene sedimentary basins at Northeast.

We observe a significant trade-off between epicentral locations and station corrections, related to the existence of a thick low-velocity layer to the NE. This effect is taken into account and minimized by re-computing station corrections, fixing the position of a subset of well-determined hypocentres, located in the 3-D tomographic model.

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https://hal-insu.archives-ouvertes.fr/insu-03581763
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Submitted on : Monday, February 21, 2022 - 4:50:44 PM
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Emanuela Matrullo, Raffaella de Matteis, Claudio Satriano, Ortensia Amoroso, Aldo Zollo. An improved 1-D seismic velocity model for seismological studies in the Campania-Lucania region (Southern Italy). Geophysical Journal International, Oxford University Press (OUP), 2013, 195, pp.460-473. ⟨10.1093/gji/ggt224⟩. ⟨insu-03581763⟩

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