ABSTRACT
The regional patterns of the macroseismic intensity of this earthquake of the seventeenth Century are almost insensitive to the gross lithological and topographical characteristics prevailing at the sites. (Each intensity “point” datum always corresponds, however, to the response of a large number of buildings over a relatively large and inhomogeneous area). Rather, source-effects seem to dominate the macroseismic regional patterns, and their geophysical inversion is able to give information on the earthquake source. In fact, an overall consistency between i) the regional patterns of macroseismic intensity, and ii) the synthetically back-predicted intensities has been obtained for this earthquake using a new source-dependent kinematic model (Bull. Seism. Soc. Am., 86, 4, 1019–1027). The focal mechanism found is compatible with the seismotectonics in the area (transcurrent, dextral, sub-vertical fault, 60 km long, with 45° of normal component, strike angle of 28°; nucleation point at 7 km depth, Lat.=37°.08, Long.=14°.93, seismic moment Mo=4.69e26 dyne cm).
