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Source Parameters Estimated from the Aftershocks of the 1997 Umbria–Marche (Italy) Seismic Sequence

Instituto Nazionale per la Fisica della Materia and Dipartimento di Matematica
Università di Genova
Via Dodecaneso 35
I-16146 Genova, Italy
bindi{at}dima.unige.it
(D.B.)

Gruppo Nazionale per la Difesa dai Terremoti and DIPTERIS
Università di Genova
Viale Benedetto XV, 5
I-16132 Genova, Italy
daniele{at}dipteris.unige.it
augliera{at}dipteris.unige.it
(D.S., P.A.)

Instituto Nazionale di Geofisica
Via di Vigna Murata
605 I-00143, Rome, Italy
cattaneo{at}ingv.it
(M.C.)

We derived the source parameters of 563 aftershocks (1.4 M_L 4.5) of the 1997 Umbria–Marche seismic sequence by analyzing three-component digital recordings of a temporary network and developed a local magnitude scale using the whole available data set (more than 25,000 waveforms) from synthetic Wood–Anderson seismograms. Then, considering a subnetwork composed of nine portable stations, more than 12,000 earthquake spectra were corrected for the near-surface attenuation parameter k and the path attenuation. The corrected spectra were used to compute the seismic moment, the source radius, and stress drop assuming an ^–2 Brune source model. We calculate the relationship log M₀ = 17.46 + 1.12 M_L between seismic moment and local magnitude for the studied area. The source dimension versus seismic moment relationship did not show any breakdown in the similarity of the rupture process, even when events of magnitude less than 2.2 (the threshold value for the completeness of the considered catalog.) were considered. The average stress drop obtained analyzing the S-wave spectra was 38 ± 10 bar, and the source dimension ranged between about 40 and 500 m.

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