SEISMIC
TOMOGRAPHY AND SURFACE GEOLOGY IN NORTH-WESTERN APENNINES (Italy)
A.
Tomaselli, Dottore di Ricerca in Geofisica, Genova, Italy, 1994
We used a local seismic
tomography technique to study the North-Western Apennines crustal structure. The
3D seismic waves velocity model has been obtained by using local earthquakes,
recorded by temporary networks of Genoa University. At depth greater than 12 km
we have computed a 1D model. We have studied the surface geological structures
and formations to find their possible
correlations with velocity structure. Tuscan Units seem to have seismic
waves velocity greater than Ligurian
Units. Low velocity zones, if they are not a computing procedure effect, are in
agreement with brittle-ductile transition. In order to verify this hypothesis,
we analysed other seismological data,
like seismicity and attenuation. Generally, superimposition of a tensive phase
on a compressive phase can be the key of lecture of tomographic data.