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Lupattelli, A.
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- PublicationOpen AccessSeismic reflection data in the Umbria Marche Region: limits and capabilities to unravel the subsurface structure in a seismically active area(2008-04)
; ; ; ;Mirabella, F.; Dipartimento di Scienze della Terra, Università degli Studi di Perugia, Italy ;Barchi, M. R.; Dipartimento di Scienze della Terra, Università degli Studi di Perugia, Italy ;Lupattelli, A.; Dipartimento di Scienze della Terra, Università degli Studi di Perugia, Italy; ; Before seismic data were made available, the subsurface setting of the Umbria-Marche area was mainly derived from the extrapolation of surface data and from models resulting from analogies with other mountain chains around the world. During the ‘90s industrial seismic data availability considerably increased, allowing the definition of new, previously unknown features. Beside the industrial seismic data availability, a deep crustal, near vertical seismic section trending E-W was acquired (CROP-03) across the Italian peninsula from the Tyrrhenian to the Adriatic coast. The subsurface data defined the compressional deformation style (thin- Vs thick- skinned) and the extensional deformation style. A set of east-dipping low-angle-normal faults, which dissect the previous compressional structures and which are the dominant features controlling the extension of the Apennines were recognised. The subsequent application of the seismic data interpretation to seismotectonic issues, defined in more detail the subsurface geometries of the active faults and the relationships between upper crust structure and seismicity.267 458 - PublicationRestrictedInsights on the seismogenic layer thickness from the upper crust structure of the Umbria-Marche Apennines (Central Italy)(2008)
; ; ; ; ; ;Mirabella, F.; Università di Perugia ;Barchi, M. R.; Università di Perugia ;Lupattelli, A.; Università di perugia ;Stucchi, E.; Università di Milano ;Ciaccio, M. G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; ; ; [1] We reconstruct the subsurface geology in a region of the northern Apennines (central Italy) where a protracted extensional sequence occurred in 1997–1998 with maximum magnitude M = 6.0. Our study is mainly based on the interpretation of three reprocessed seismic reflection profiles crossing the epicentral area, which constrain the subsurface geometry to a depth of about 12 km where most of the shallow seismicity occurs. Comparing the subsurface setting with accurately determined earthquake locations, we find that the seismicity is located entirely within the sedimentary cover and does not penetrate the underlying basement. This is explained by considering that the sedimentary cover is rather thick and composed of relatively strong lithologies (platform carbonates and evaporites), while the upper part of the basement consists of weak phyllites and siliciclastic rocks. This weak horizon is also evidenced by the low-Vp values measured in deep wells of the region. Its effect is to decouple the sedimentary cover from the crystalline basement, where only microseismicity occurs. Our study indicates that local structure and stratigraphy can significantly influence the distribution of seismicity within the upper crust, particularly in complex geological environments such as thrust-and-fold belts.393 40