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Wustefield, A.
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- PublicationOpen AccessCrustal fracturing and presence of fluid as revealed by seismic anisotropy: Case histories from seismogenic areas in the Apennines (Italy)(2012)
; ; ; ; ; ; ; ; ; ; ; ; ;Pastori, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Valoroso, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Piccinini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Wustefield, A.; University of Bristol (UK) ;Zaccarelli, L.; Institut de Physique du Globe de Paris (FR) ;Bianco, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Kendall, M.; University of Bristol (UK) ;Di Stefano, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Chiaraluce, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Di Bucci, D.; Dipartimento della Protezione Civile ;Margheriti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Barchi, M.; Università degli Studi di Perugia (IT); ; ; ; ; ; ; ; ; ; ; An automatic analysis code, Anisomat+, was developed, tested and improved to calculate anisotropic parameters: fast polarization direction and delay time. Anisomat+ was applied on data coming from three zones of the Apennines in Italy. For each area, anisotropic parameters have been interpreted to determine the fracture and stress field taking into account the geological and structural settings. It was recognized that average of fast directions are oriented NW-SE at all sites, in agreement with the orientation of maximum horizontal stress and also with the strike of the main fault structures. The mean values of normalized delay time range from 0.005 s/km to 0.007 s/km and to 0.009 s/km, respectively for L'Aquila region, Alto Tiberina Fault area and Val D'Agri basin, suggesting a 3-4% of crustal anisotropy. Moreover, for each area, the spatial distributions of anisotropic parameters are examined, for L’Aquila 2009 seismic sequence also their temporal distribution is discussed.696 1417