A Source Study of the 9 September 1998 (Mw 5.6) Castelluccio Earthquake in Southern Italy using Teleseismic and Strong Motion Data |
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Authors: | G Arrigo Z Roumelioti Ch Benetatos A Kiratzi A Bottari G Neri D Termini A Gorini S Marcucci |
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Institution: | (1) Osservatorio Sismologico – Di.C.T.A., University of Messina, Via Osservatorio 4, 98121 Messina, Italy;(2) Department of Geophysics, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;(3) Department of Earth Sciences, University of Messina, Salita Sperone 31, 98166 Messina, Italy;(4) Servizio Sismico Nazionale, Via Curtatone 3, 00185 Rome, Italy |
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Abstract: | Teleseismic and strong motion data are used to derive the source parameters of the September 9, 1998 Castelluccio earthquake
(M5.6). Teleseismic body-wave modeling indicates normal faulting (Plane 1: strike = 328°, dip = 50°, rake = −75°; Plane 2:
strike = 126°, dip = 42°, rake = −107°) along NW–SE striking planes. Both nodal planes of the computed focal mechanism are
tested for their capability of reproducing the mainshock acceleration time histories at three strong motion stations. Synthetic
accelerograms are estimated using the stochastic method for finite sources in combination with the H/V ratios technique for
the incorporation of the site effect. Our preferred model, which provided the best fit between synthetic and observed waveforms
and corresponding Fourier amplitude spectra, consists of a NE-dipping normal fault with dimensions 8 × 7 km. The rupture nucleation
point, which is assumed to coincide with the hypocenter location, was confined to the southeasternmost, deepest part of the
fault. Our results are in good agreement with the so far released information regarding the aftershock sequence of the examined
event, as well as the general seismotectonic knowledge on the broader epicentral area. |
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Keywords: | Southern Italy focal mechanisms strong ground motion stochastic methods teleseismic waveform modeling |
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