Rupture characterization of a low magnitude earthquake of central Apennines (Italy)

Details Rupture characterization of a low magnitude earthquake of central Apennines (Italy) Rupture characterization of a low magnitude earthquake of central Apennines (Italy)

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...82..157i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 82, Issue 2, p. 157-165.

Physics

Scientific paper

This paper describes a detailed study of the rupture mechanism of a ML = 3 aftershock of the 1984 Abruzzo (Central Italy) earthquake (Ms = 5.8). To study the rupture extension, shape and directivity, the time durations of P and S far-field pulses were analyzed in different directions corresponding to six recording stations. The path corrected far-field displacement P and S pulses at six seismic stations were determined using the empirical Green function method. The fault plane solution has been estimated by joint inversion of P polarities and S polarizations measured on three component records. Finally, we used a method based on the plot of `isochrons' associated with the observed pulse widths and projected on each nodal plane. The comparison of isochron plots for the two nodal planes suggests a rupture fault plane striking along the Apenninic direction.
A weak source directivity up and west-ward on the fault plane was observed. A maximum ruptured surface of 0.4 km2 was estimated assuming a sub-shear rupture process. The estimate of the seismic moment from spectral measurements gives the static stress drop ranging from 1 to 66 bar for the rupture velocity ranging between 0.2 β and β, where β is the shear wave velocity at the source.

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