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Pazzaglia, Fausto
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Pazzaglia, Fausto
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- PublicationRestrictedMorphotectonics of the Upper Tiber Valley (Northern Apennines, Italy) through quantitative analysis of drainage and landforms(2014-10)
; ; ; ; ; ; ;Melelli, L.; Dipartimento di Fisica e Geologia, Universita` di Perugia, Perugia, Italy ;Pucci, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Saccucci, L.; Dipartimento di Fisica e Geologia, Universita` di Perugia, Perugia, Italy ;Mirabella, F.; Dipartimento di Fisica e Geologia, Universita` di Perugia, Perugia, Italy ;Pazzaglia, F.; Dipartimento di Fisica e Geologia, Universita` di Perugia, Perugia, Italy ;Barchi, M.; Dipartimento di Fisica e Geologia, Universita` di Perugia, Perugia, Italy; ; ; ; ; We present a geomorphological analysis of the recent extensional tectonics of a Quaternary continental basin in the Northern Apennines (Italy). The study area is focused on Upper Tiber Valley (UTV), a basin elongated for 70 km in NNW-SSE direction hosting the Tiber River. The area is characterized by a series of features that make it an excellent case study: (i) homogeneity of lithology (ii) active faults, and (iii) strong morphogenetic activity. In this study, 36 hydrographical basins, tributaries of Tiber River, have been analysed. A preliminary qualitative geomorphological setting was outlined pointing out that the drainage river network shows meaningful evidence of tectonic control, such as abrupt changes in stream directions, knickpoints and steepness anomalies alignments along meaningful length in adjacent basins. Besides, the tectonic control is well marked in base level changes and consequent tectonically induced downcutting. Signs of neotectonics are highlighted by structural landforms too. The entrenchment of alluvial fans, the triangular facets and the fault planes are mapped by field survey and aerial photo interpretation. In addition, a quantitative analysis was also performed. Linear, areal and volumetric indexes related to drainage basins and river networks are taken into account. The geometry of the escarpments delimiting the basin and the landforms detected along the adjacent piedmont are investigated. The ranges of values, according to the existing literature, confirm a condition of wide-ranging morphological disturbance. In the central part of the study area, while the western basins are almost in equilibrium, the eastern ones reveal clear signs of disequilibrium, this is particularly evident along the distal segment of the river network. These data, joined with the characteristics of the escarpment and piedmont junction, confirm that the neotectonic activity, in the centre and in the eastern side of the basin, is the main factor controlling the morphological system.371 38 - PublicationRestrictedInteraction between regional and local tectonic forcing along a complex Quaternary extensional basin: Upper Tiber Valley, Northern Apennines, Italy(2014-09)
; ; ; ; ; ; ; ; ;Pucci, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Mirabella, F.; Dipartimento di Fisica e Geologia, Universit a di Perugia, Piazza dell'Universit a, 00123 Perugia, Italy ;Pazzaglia, F.; Dipartimento di Fisica e Geologia, Universit a di Perugia, Piazza dell'Universit a, 00123 Perugia, Italy ;Barchi, M. R.; Dipartimento di Fisica e Geologia, Universit a di Perugia, Piazza dell'Universit a, 00123 Perugia, Italy ;Melelli, L.; Dipartimento di Fisica e Geologia, Universit a di Perugia, Piazza dell'Universit a, 00123 Perugia, Italy ;Tuccimei, P.; Science Department, Section of Earth Science, University Roma 3, Largo San L. Murialdo, 00146 Rome, Italy ;Soligo, M.; Science Department, Section of Earth Science, University Roma 3, Largo San L. Murialdo, 00146 Rome, Italy ;Saccucci, L.; Dipartimento di Fisica e Geologia, Universit a di Perugia, Piazza dell'Universit a, 00123 Perugia, Italy; ; ; ; ; ; ; In extending areas undergoing regional tectonic uplift, the persistence of subsidence at a normal-fault hanging-wall depends on the competition between regional and local tectonic effects. When regional uplift exceeds the subsidence of the hanging-wall block, denudation prevails at both the hanging-wall and the foot-wall. When local tectonic subsidence exceeds regional uplift, sedimentation occurs over the hanging-wall block, supplied by foot-wall erosion. We analyzed a PlioceneeQuaternary continental basin, currently crossed by the Tiber River in Italy. The tectono-sedimentary evolution of the basin developed at the hanging-wall of a regional low-angle extensional detachment, the Alto Tiberina Fault, in the axial region of the Northern Apennines of Italy. This area is affected by regional uplift on the order of 0.5e1.0 mm/yr. The present-day activity of the fault is revealed by both microseismicity and geodetic (GPS) data. We investigated the mid- (10e100 ka) and long-term (0.5e3.0 Ma) evolution of the three depocenters by studying the continental Pleistocene succession infilling the basin as well as fluvial terraces and higher paleosurfaces carved into the Pleistocene deposits. By using surficial geologic data and an interpretation of a set of seismic reflection profiles, we show that the three depocenters experienced a fairly similar evolution during the PlioceneeEarly Pleistocene, when a 1000-m-thick continental succession was deposited. On the contrary, geomorphological observations indicate that, at the beginning of the Middle Pleistocene, a switch occurred in the evolution of the three depocenters. In the northernmost Sansepolcro sub-basin, bounding normal faults are active and hanging-wall subsidence outpaces regional uplift. Concurrently, in the Umbertide and Ponte Pattoli subbasins uplift dominates over the hanging-wall subsidence, promoting river incision and exhumation of the Pleistocene deposits. For these two depocenters, by means of terrace-river correlations, we estimate that the incision rate is ~0.3e0.35 mm/yr, suggesting a maximum tectonic subsidence of 0.2 mm/yr. The identification of a heterogeneous uplift pattern along the hanging-wall of the Alto Tiberina Fault, driven by different displacement rates of its fault splays, allowed us to characterize fault segments with different activities and, possibly, different seismic behaviors.332 19