http://hdl.handle.net/2122/125 Ricerca nel canale cerca http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/5928 Titolo: Deformation of 125 ka marine terraces: tectonic implications<br/><br/>Autori: Bordoni, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia; Valensise, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Curatori: Stewart, I. S.; Brunel University, London; Vita-Finzi, C.; University College London<br/><br/>Abstract: In peninsular Italy, marine terraces and shorelines created during oxygen- isotope substage 5e, known historically as the Tyrrhenian highstand, provide a reliable and homogeneous datum of vertical motions during the past 125,000 years. Published accounts of 121 locations on the Tyrrhenian inner edge were reinterpreted and used to calculate both local and regional uplift rates. The data show arching of southern Italy between the Tyrrhenian and the Adriatic coasts and of the Calabrian Arc between the Sangineto and the Longi-Taormina tectonic lineaments at rates of up to 1.2 mm/yr for the past 125 ka. They also suggest that the present configuration of the southern Apennines is the product of post-Early Pleistocene regional uplift superimposed on Tortonian to Early Pleistocene thrusting. Uplift patterns are characterised by different wavelength in different geodynamic settings, suggesting a close link with the depth of the causative tectonic sources. Thu, 01 Jan 1998 00:00:00 GMT http://hdl.handle.net/2122/5474 Titolo: Evoluzione geomorfologica di un'area suburbana di Castronuovo S. Andrea (PZ) ed incidenza delle piogge su alcuni movimenti di massa<br/><br/>Autori: D'Ecclesiis, G.; Università della Basilicata; Grassi, D.; Università della Basilicata; Merenda, L.; CNR-IRPI; Polemio, M.; CNR-IRPI; Sdao, F.; Università della Basilicata<br/><br/>Abstract: This work deals with the results obtained from geomorphological and hydrological investigation conducted in order to point out the complex geomorphological evolution related to a large part of the Castronuovo S. Andrea (Pz) territory, to identify the landslide typology of two different mass movements under investigation, as well as the influence caused by the rainfall. The landslide under study occurred on two opposite slopes of the low valley of torrent Mastro Ciardi, characterized by the same stratigraphic-structural, hydrogeological and geotechnical environment. The first slope e can be ascribed to a displacement of a first detachment, while the other one brat least 700io can be referred to a rimobilization phenomenon; both landslides, to a variable extent, have been influenced by tectonic joints following two different directions: NE - SW and WNW - ESE.As far as the last 40 years are concerned, the morphological evolution of the areas under study has been obtained resorting to analyses, even comparative, of aerial photos at different generation; the relationship between rainfall and landslide has been identified in an empirical way through special models. Tue, 01 Jan 1991 00:00:00 GMT http://hdl.handle.net/2122/4180 Titolo: Lakes and subglacial hydrological networks around Dome C, East Antarctica<br/><br/>Autori: Rémy, F.; Laboratoire d’Etudes en Géophysique et Océanographie Spatiale, 18 avenue Edouard Belin, 31055 Toulouse Cedex, France; Testut, L.; Laboratoire d’Etudes en Géophysique et Océanographie Spatiale, 18 avenue Edouard Belin, 31055 Toulouse Cedex, France; Legrésy, B.; Laboratoire d’Etudes en Géophysique et Océanographie Spatiale, 18 avenue Edouard Belin, 31055 Toulouse Cedex, France; Forieri, A.; Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Cicognara 7, I-20129 Milan, Italy; Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Tabacco, I. E.; Dipartimento di Scienze della Terra, Università degli Studi di Milano, Via Cicognara 7, I-20129 Milan, Italy<br/><br/>Abstract: Precise topography from European Remote-sensing Satellite radar altimetryand high density of airborne radio-echo sounding in the area surrounding Dome C,Antarctica, show a link between surface features and subglacial lakes. In this paper, we extend the study to fine structures by computing a curvature-based coefficient (cy) related to surface undulations. These coefficient variations reveal many surface undulations, and some elongated features of this parameter seem to link known subglacial lakes. A population of high values of this coefficient, assumed to correspond to transitions between sliding and non-sliding flow regime, strengthen the appearance of a network which would link most of the lakes in the area. The existence of such a network impacts on ice-flow dynamics and onsubglacial-lake studies. Wed, 01 Jan 2003 00:00:00 GMT http://hdl.handle.net/2122/4179 Titolo: Influence of geometrical boundary conditions on the estimation of rheological parameters<br/><br/>Autori: Testut, L.; UMR5566, Groupe de Recherche de Géodésie Spatiale, CNES-CNRS, Toulouse Cedex 31055, France; Tabacco, I. E.; Dipartimento di Scienze della Terra, Università degli Studi di Milano, I-20129 Milan, Italy; Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Rémy, F.; UMR5566, Groupe de Recherche de Géodésie Spatiale, CNES-CNRS, Toulouse Cedex 31055, France<br/><br/>Abstract: Improved knowledge of geometrical boundary conditions, such as bedrock geometry and surface topography, can contribute significantly to glaciological studies including ice-sheet-flow modelling. Precise thickness and altimetric data allow anestimation of ice-flow direction, the balance velocity and the basal shear stress. Theseparameters are calculated along a 1160 km profile in East Antarctica using a relationship between shear stress, basal temperature, the Glen flow exponent and a parameter related to strain rate. Strong variations of the flow-law parameters and basal conditions are found to play a major role in the ice-flow pattern. Sliding, anisotropy and longitudinal stressstrongly perturb the validity of the law, but their signature can be identified. Sat, 01 Jan 2000 00:00:00 GMT http://hdl.handle.net/2122/4178 Titolo: Electromagnetic reflecting properties of sub-ice surfaces<br/><br/>Autori: Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Forieri, A.; Sezione Geofisica, Università di Milano, Via Cicognara 7, I-20129 Milan, Italy; Tabacco, I. E.; Sezione Geofisica, Università di Milano, Via Cicognara 7, I-20129 Milan, Italy<br/><br/>Abstract: The power strength of the radio-echo signal coming from reflecting sub-ice surfaces is used to determine the nature of the reflecting surface, i.e. rock, water or sea water. Electromagnetic analysis shows that the amplitude variations detected by radio-echo sounding are mainly due to the nature of the interface as well as the concave or convex shape of the reflectors. In this paper, some relevant profiles showing the power variations due to the different nature of the interface and the shape of thereflectors are presented. These results are important both for surface shape determination and for subglacial lake detection. Thu, 01 Jan 2004 00:00:00 GMT http://hdl.handle.net/2122/4053 Titolo: Geophysical survey at Talos Dome, East Antarctica: the search for a new deep-drilling site<br/><br/>Autori: Frezzotti, M.; ENEA, Centro Ricerche Casaccia, P.O. Box 2400, I-00100 Rome, Italy; Bitelli, G.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy; De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Deponti, A.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy; Forieri, A.; Department of Earth Sciences, University of Milan, Via Cicognara 7, I-20129 Milan, Italy and Department of Earth Sciences, University of Siena, Via del Laterino 8, I-53100 Siena, Italy; Gandolfi, S.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy; Maggi, V.; Department of Environmental Sciences, University of Milano–Bicocca, Piazza della Scienza 1, I-20126 Milan, Italy; Mancini, F.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy; Remy, F.; Legos, CNRS-CNES-UPS, 18 av. Edouard Belin, 31055 Toulouse Cedex, France; Tabacco, I. E.; Department of Earth Sciences, University of Milan, Via Cicognara 7, I-20129 Milan, Italy; Urbini, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Vittuari, L.; DISTART, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy; Zirizzotti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: Talos Dome is an ice dome on the edge of the East Antarctic plateau; because accumulationis higher here than in other domes of East Antarctica, the ice preserves a good geochemical and palaeoclimatic record. A new map of the Talos Dome area locates the dome summit using the global positioning system (GPS) (72˚47’ 14’’S, 159˚04’ 2’’E; 2318.5m elevation (WGS84)). A surface strain network of nine stakes was measured using GPS. Data indicate that the stake closest to the summitmoves south-southeast at a few cma–1. The other stakes, located 8 km away, move up to 0.33ma–1. Airborne radar measurements indicate that the bedrock at the Talos Dome summit is about 400m in elevation, and that it is covered by about 1900m of ice. Snow radar and GPS surveys show that internallayering is continuous and horizontal in the summit area (15 km radius). The depth distribution analysis of snow radar layers reveals that accumulation decreases downwind of the dome (north-northeast) and increases upwind (south-southwest). The palaeomorphology of the dome has changed during the past 500 years, probably due to variation in spatial distribution of snow accumulation, driven by wind sublimation. In order to calculate a preliminary age vs depth profile for Talos Dome, a simple one-dimensional steady-state model was formulated. This model predicts that the ice 100m above the bedrock may cover one glacial–interglacial period. Thu, 01 Jan 2004 00:00:00 GMT http://hdl.handle.net/2122/3821 Titolo: grid_strain and grid_strain3: software packages for strain field computation in 2D and 3D environment<br/><br/>Autori: Teza, G.; Geoscienze, Università Padova; Pesci, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna; Galgaro, A.; Geoscienze, Università Padova<br/><br/>Abstract: Two MatlabTM software packages for strain field computation, starting from displacements of experimental points (EPs), are here presented. In particular, grid_strain estimates the strain on the nodes of a regular planar grid, whereas grid_strain3 operates on the points of a digital terrain model (DTM). In both cases, the computations are performed in a modified least square approach, emphasizing the effects of nearest points.This approach allows users to operate at different scales of analysis by introducing a scale factor to reduce or also exclude too far points from grid nodes. The input data are displacements (or velocities) that can be provided by several techniques (e.g. GPS, total topographical station, terrestrial laser scanner). The analysis can be applied to both regional- and local-scale phenomena, to study tectonic crustal deformations or rapid landslide collapses, and to characterize the kinematics of the studied system. Errors on strains and geometric significance of the results are also provided. Sun, 23 Sep 2007 00:00:00 GMT http://hdl.handle.net/2122/3284 Titolo: Setting new tools to quantify the tectonic and gravity contribution in seismogenic areas<br/><br/>Autori: Moro, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Saroli, M.; Università di Cassino; Salvi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Gori, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Falcucci, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Stramondo, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Doumaz, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Messina, P.; Istituto di Geologia Ambientale e Geoingegneria, CNR, Roma; Galadini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia<br/><br/>Abstract: Setting new tools to quantify the tectonic and gravity contribution in seismogenic areas Wed, 12 Sep 2007 00:00:00 GMT http://hdl.handle.net/2122/3277 Titolo: Quaternary tectonics of the abruzzi Appennines (Italy) inferred from integrated geomorfological-stratigraphic data<br/><br/>Autori: Messina, P.; Istituto di Geologia Ambientale e Geoingegneria, CNR, Roma, Italy; Dramis, F.; Università degli Studi, Roma Tre; Galadini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Falcucci, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Giaccio, B.; Istituto di Geologia Ambientale e Geoingegneria, CNR, Roma, Italy; Gori, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Moro, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Saroli, M.; Università di Cassino; Sposato, A.; Istituto di Geologia Ambientale e Geoingegneria, CNR, Roma, Italy<br/><br/>Abstract: Quaternary tectonics of the abruzzi Appennines (Italy) inferred from integrated geomorfological-stratigraphic data Wed, 12 Sep 2007 00:00:00 GMT http://hdl.handle.net/2122/3265 Titolo: Seismic Geomorphology<br/><br/>Autori: Dramis, F.; 0; Galadini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Galli, P.; 0; Vittori, E.; 0<br/><br/>Abstract: seismic geomorphology Fri, 01 Jun 2007 00:00:00 GMT