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Ciuffi, S.
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- PublicationOpen AccessThree-dimensional tomography and rock properties of the Larderello-Travale(2008-11)
; ; ; ; ; ; ;De Matteis, R.; Dipartimento di Studi Geologici ed Ambientali, Università del Sannio ;Vanorio, T.; Department of Geophysics, Stanford University ;Zollo, A.; Dipartimento di Scienze Fisiche, Università di Napoli Federico II ;Ciuffi, S.; ENEL GEM-Geothermal Production ;Fiordelisi, A.; ENEL GEM-Geothermal Production ;Spinelli, E.; ENEL GEM-Geothermal Production; ; ; ; ; In a geothermal area, a detailed knowledge of the three-dimensional velocity structures aids the managementof the field and the further development of the geothermal source. Here,we present a high-resolution study of the three-dimensional S-wave velocity structures from microearthquake travel times for the Larderello-Travale geothermal field, Italy.We have also deduced the Vp/Vs and Vp ×Vs parameters for this area toemphasize the deep variations in the physical rock properties due to fluid content and porosity. Furthermore, effective porousmedium modelling has been performed for site-relevant lithologies, to improve our interpretation of the results in terms of rock physics signatures. This has allowed us to estimate the variation range of the seismological parameters investigated, as well as their sensitivity for suitable rock under specific physical conditions. LowVp/Vs anomalies, arising froma lower Vp compared to Vs, dominate the geothermal field of Larderello-Travale. These have been interpreted as due to steam-bearing formations. On the contrary, analysis of Vp ×Vs images provides information on the relative changes in rock porosity at depth. Comparison of tomographic section images with previously interpreted seismic lines suggests that the reflective ‘K-horizon’ delineates a transition between zones that have different porosities or crack gatherings. The ‘K-horizon’ also lies on low Vp/Vs anomalies, which suggests a steam saturation zone, despite the reduced porosity at this depth.247 298 - PublicationOpen AccessRilocalizzazione di terremoti, modelli 3D di Vp, Vp/Vs e Qp nell’area geotermica di Larderello.(2006-11)
; ; ; ; ; ;Piccinini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Chiarabba, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Braun, T.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Ciuffi, S.; Enel, Pisa ;Fiordelisi, A.; Enel, Pisa; ; ; ; L'area geotermica di Larderello è caratterizzata da un elevato flusso di calore (tra 120 e 1000 mW/m2) e geologicamente caratterizzata da bacini postorogenici riempiti da depositi neogenici, risultato di un diffuso assottigliamento crostale accompagnato da risalite di materiale dal mantello superiore fino a profondità di pochi chilometri.122 208