http://hdl.handle.net/2122/196 Ricerca nel canale cerca http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/6035 Titolo: Insights into fluid circulation across the Pernicana Fault (Mt. Etna, Italy) and implications for flank instability<br/><br/>Autori: Siniscalchi, A.; Dipartimento di Geologia e Geofisica, Università degli Studi di Bari, via Orabona, 4-70125, Bari-Italy; Tripaldi, S.; Dipartimento di Geologia e Geofisica, Università degli Studi di Bari, via Orabona, 4-70125, Bari-Italy; Neri, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; Giammanco, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; Piscitelli, S.; Istituto di Metodologie per l' Analisi Ambientale, CNR, Tito (PZ), Italy; Balasco, M.; Istituto di Metodologie per l' Analisi Ambientale, CNR, Tito (PZ), Italy; Behncke, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; Magri, C.; Dipartimento di Geologia e Geofisica, Università degli Studi di Bari, via Orabona, 4-70125, Bari-Italy; Naudet, V.; Université Bordeaux 1, Geosciences Hydrosciences Material and Constructions, GHYMAC-EA 4134, Talence, F-33405, France; Rizzo, E.; Istituto di Metodologie per l' Analisi Ambientale, CNR, Tito (PZ), Italy<br/><br/>Abstract: We conducted geophysical–geochemical measurements on a ∼2 kmN–S profile cutting across the PernicanaFault, one of the most active tectonic features on the NE flank of Mt. Etna. The profile passes from theunstable E flank of the volcano (to the south) to the stable N flank and significant fluctuations in electricalresistivity, self-potential, and soil gas emissions (CO2, Rn and Th) are found. The detailed multidisciplinaryanalysis reveals a complex interplay between the structural setting, uprising hydrothermal fluids, meteoricfluids percolating downwards, ground permeability, and surface topography. In particular, the recoveredfluid circulation model highlights that the southern sector is heavily fractured and faulted, allowing theformation of convective hydrothermal cells. Although the existence of a hydrothermal system in a volcanicarea does not surprise, these results have great implications in terms of flank dynamics at Mt. Etna. Indeed,the hydrothermal activity, interacting with the Pernicana Fault activity, could enhance the flank instability.Our approach should be further extended along the full extent of the boundary between the stable andunstable sectors of Etna for a better evaluation of the geohazard in this active tectonic area. http://hdl.handle.net/2122/5813 Titolo: A clustering approach to multiparameter geophysical data: different scale examples<br/><br/>Autori: Di Giuseppe, M.G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Troiano, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Petrillo, Z.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Siniscalchi, A.; Dipartimento di Geologia e Geofisica, Università di Bari, Bari, Italy.; Berrino, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Bruno, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Magrì, C.; Dipartimento di Geologia e Geofisica, Università di Bari, Bari, Italy.<br/><br/>Curatori: Berrino, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; D'Errico, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Di Giuseppe, M.G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Petrillo, Z.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Ricciardi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia; Troiano, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia<br/><br/>Abstract: The correlation and integration of geophysical images obtained by severaldataset of different nature, as seismic, magnetic, electric, electromagneticand gravimetric, are usually limited to their qualitative observation andcomparison http://hdl.handle.net/2122/5801 Titolo: An experimental application of a 3D terrestrial laser scanner and acoustic techniques in assessing the quality of the stones used in monumental structures<br/><br/>Autori: Casula, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; Fais, S.; DIGITA - Dipartimento di GeoIngegneria e Tecnologie Ambientali - Università di Cagliari - Italy; Ligas, P.; DIGITA - Dipartimento di GeoIngegneria e Tecnologie Ambientali - Università di Cagliari - Italy<br/><br/>Abstract: AbstractThis paper briefly describes the preliminary results of an experimentation aimed to test a new non-destructive methodology based on the integrated application of 3-D terrestrial laser scanning and acoustic techniques in the ultrasonic range (54 kHz) in evaluating the quality of carbonatic stone materials. Our target is to evaluate the state of conservation of stone building materials by correlating ultrasonic longitudinal pulse velocity and frequency spectra of the ultrasonic signals with the reflectivity or reflectance of the reflected 3-D laser scanner beam pulse transmitted to the target of an investigated surface. http://hdl.handle.net/2122/5669 Titolo: Moho deepening and shallow upper crustal delamination beneath the central Apennines<br/><br/>Autori: Di Luzio, E.; CNR-IGAG; Mele, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Tiberti, M. M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Cavinato, G. P.; CNR-IGAG; Parotto, M.; Università degli Studi Roma Tre<br/><br/>Abstract: Geologic interpretation of seismic data along the eastern half of the CROP 11 deep seismic reflection profile,running across the central Apennines, indicates that the Adriatic Moho deepens gradually from 34 km in theforeland areas to 47 km beneath the core of the belt. This deepening is in agreement with local Moho depthsestimated from teleseismic receiver functions at several stations installed along the CROP 11 profile. On thecontrary, DSS (Deep Seismic Soundings) data image the Moho at shallower depths. The deepening of theAdriatic Moho illustrated in this paper supports the westward downgoing of a portion of Adriatic continentalcrust and is consistent with the regional gravity anomalies, provided that very high-density rocks are presentabove the Moho at the core of the central Apennine belt. We discuss geophysical and geologic data in theframework of alternative models of delamination of the Adriatic crust at different depth. http://hdl.handle.net/2122/5563 Titolo: La ricostruzione dello scuotimento del terremoto del Garda del 2004 (ML=5.2)<br/><br/>Autori: Franceschina, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Pessina, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Di Giacomo, D.; GFZ, Potsdam, Germany; Massa, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Milano-Pavia, Milano, Italia; Mulargia, F.; Dip. Fisica, Università Bologna; Castellaro, S.; Dip. Fisica, Università Bologna; Mucciarelli, M.; DiSSG, Università Basilicata<br/><br/>Abstract: Il terremoto di magnitudo ML=5.2 che nel 2004 ha colpito il latooccidentale del Lago di Garda (Nord Italia) viene modellato sianell’approssimazione di sorgente puntiforme sia mediante simulazionida sorgente estesa, al fine di investigare l’anisotropia del campodi risentimento osservata tra 5 e 15 km di distanza epicentrale. Ilconfronto con le osservazioni viene effettuato in termini intensitàmacrosismica IMCS osservata, considerando i soli comuni localizzatisu roccia (o formazione «rigida») fino a 40 km dall’epicentro; unulteriore confronto fra simulazioni e osservazioni viene effettuatoutilizzando i dati registrati dalla stazione accelerometrica di VallioTerme (GVD), localizzata a 13.3 km dall’epicentro, appartenente allarete nazionale (RAN).Le simulazioni più semplici utilizzano una sorgente puntiformeed equazioni predittive empiriche in termini di intensità. Le modellazionia faglia estesa riproducono il campo di scuotimento in terminidi valori di picco dello scuotimento, successivamente convertiti inintensità attraverso relazioni empiriche. Nonostante la moderatamagnitudo dell’evento, le simulazioni a faglia estesa, che richiedonol’assunzione di ipotesi plausibili sia sulla geometria della sorgenteche sulle proprietà di attenuazione del mezzo di propagazione, sonoin grado di confermare l’anisotropia osservata della distribuzione diintensità a scala regionale (30×30 km2). Inoltre, poiché la distribuzionedelle intensità presenta anche eterogeneità a scala locale (didimensione inferiore a 3 km), probabilmente dovute ad effetti geologicie geomorfologici, oppure ad effetti di interazione terreno-struttura,nella seconda parte del lavoro vengono presentati alcuni esempidi misure di rumore sismico e di misure di frequenza propriadegli edifici. http://hdl.handle.net/2122/5366 Titolo: EMSO: European multidisciplinary seafloor observatory<br/><br/>Autori: Favali, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Beranzoli, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: EMSO has been identified by the ESFRI Report 2006 as one of the Research Infrastructures that European members and associated states are asked to develop in the next decades. It will be based on a European-scale network of multidisciplinary seafloor observatories from the Arctic to the Black Sea with the aim of long-term real-time monitoring of processes related to geosphere/biosphere/hydrosphere interactions.EMSO will enhance our understanding of processes, providing long time series data for the different phenomenon scales which constitute the new frontier for study of Earth interior, deep-sea biology and chemistry, and ocean processes. The development of an underwater network is based on past EU projects and is supported by several EU initiatives, such as the on-going ESONET-NoE, aimed atstrengthening the ocean observatories’ scientific and technological community. The EMSO development relies on the synergy between the scientific community and industry to improve Europeancompetitiveness with respect to countries such as USA, Canada and Japan. Within the FP7 Programme launched in 2006, a call for Preparatory Phase (PP) was issued in order to support the foundation of the legal and organisational entity in charge of building up and managing the infrastructure, andcoordinating the financial effort among the countries. The EMSO-PP project,coordinated by the Italian INGV with participation by 11 institutions from as many European countries, started in April 2008 and will last four years. http://hdl.handle.net/2122/5109 Titolo: Intrusion of eccentric dikes: The case of the 2001 eruption and its role in the dynamics of Mt. Etna volcano<br/><br/>Autori: Bonforte, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; Gambino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; Neri, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia<br/><br/>Abstract: The 2001 eruption represents one of the most studied events both from volcanological and geophysical pointof view on Mt. Etna. This eruption was a crucial event in the recent dynamics of the volcano, marking thepassage from a period (March 1993–June 2001) of moderate stability with slow, continuous flank sliding andcontemporaneous summit eruptions, to a period (July 2001 to present) of dramatically increased flankdeformations and flank eruptions. We show new GPS data and high precision relocation of seismicity inorder to demonstrate the role of the 2001 intrusive phase in this change of the dynamic regime of thevolcano. GPS data consist of two kinematic surveys carried out on 12 July, a few hours before the beginning ofthe seismic swarm, and on 17 July, just after the onset of eruptive activity. A picture of the spatial distributionof the sin-eruptive seismicity has been obtained using the HypoDD relocation algorithm based on thedouble-difference (DD) technique. Modeling of GPS measurements reveals a southward motion of the uppersouthern part of the volcano, driven by a NNW–SSE structure showing mainly left-lateral kinematics. Precisehypocenter location evidences an aseismic zone at about sea level, where the magma upraise wascharacterized by a much higher velocity and an abrupt westward shift, revealing the existence of a weakenedor ductile zone.These results reveal how an intrusion of a dike can severely modify the shallow stress field, triggeringsignificant flank failure. In 2001, the intrusion was driven by a weakened surface, which might correspond toa decollement plane of the portion of the volcano affected by flank instability, inducing an additional stresstestified by GPS measurements and seismic data, which led to an acceleration of the sliding flanks. http://hdl.handle.net/2122/5068 Titolo: Integrated MVG and ERT Survey Over a Shallow Cave<br/><br/>Autori: Gambetta, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Armadillo, E.; UNIGE - Dipteris; Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Stefanelli, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia<br/><br/>Abstract: An integrated geophysical MVG (Microgravity Vertical Gradient) and ERT(Electrical Resistivity Tomography) survey was performed over a shallowcave in the Armetta Mountain karst area, close to the Liguria-Piedmont wa-tershed (Tanaro valley). The aim of this study is to test the response of aknown shallow karst cave. The cave was developed in the Mesozoic sedimen-tary cover (dolostones and limestones - CAU : Caprauna Armetta Unit); theshallowest portion of the cave exhibits narrow passages and, at about 30 mbelow the entrance, a fossil meander which links two large chambers, thatrepresent the target of the geophysical survey..... http://hdl.handle.net/2122/5004 Titolo: Integrated geophysical survey to recognize ancient Picentia’s buried walls, in the Archaeological Park of Pontecagnano – Faiano (Southern Italy)<br/><br/>Autori: Fedi, M.; Dipartimento di Scienze della Terra, Università degli studi di Napoli «Federico II», Napoli, Italy; Florio, G.; Dipartimento di Scienze della Terra, Università degli studi di Napoli «Federico II», Napoli, Italy; Garofalo, B.; Centro Regionale di Competenza per lo Sviluppo ed il Trasferimento dell'Innovazione Applicata ai Beni Culturali e Ambientali INNOVA, Pozzuoli (NA), Italy; La Manna, M.; Centro Regionale di Competenza per lo Sviluppo ed il Trasferimento dell'Innovazione Applicata ai Beni Culturali e Ambientali INNOVA, Pozzuoli (NA), Italy; Pellegrino, C.; Dipartimento di Beni Culturali, Laboratorio di Archeologia «M. Napoli», Università di Salerno, Fisciano (SA), Italy; Rossi, A.; Dipartimento di Beni Culturali, Laboratorio di Archeologia «M. Napoli», Università di Salerno, Fisciano (SA), Italy; Soldovieri, M. G.; Dipartimento di Scienze della Terra, Università degli studi di Napoli «Federico II», Napoli, Italy<br/><br/>Abstract: There is no information on previous geophysical prospections carried out in the Archaeological Park of Pontecagnano-Faiano, in order to reconstruct the ancient settlement of Picentia, an Etrusco-Campanian and Romansettlement near Salerno (Southern Italy). Therefore, an integrated geophysical survey based on magnetic, geoelectricand ground-penetrating radar (GPR) prospections was executed in the Park. The methods provided abasic map of buried ancient structures at depth from 0.1-0.2 to about 1.5 meters. Magnetic data were processedanalyzing the analytical signal of the vertical derivative of the measured gradient and this substantially reduceda strong fence effect. The results of the geophysical prospections showed archaeological structures located closeto those discovered in the excavated areas. The shape of the anomalies are usually elongated with well-definedgeometrical characteristics. Many anomalies are arranged along orthogonal directions and they are very coherentwith the excavated structures, namely the quarters structures of the ancient Picentia. http://hdl.handle.net/2122/4997 Titolo: The GRACE-satellite gravity and geoid fields in analysing large-scale,<br/><br/>Autori: Braitenberg, Carla; Ebbing, Jörg<br/><br/>Abstract: The recently released gravity potential field development derived from the GravityRecovery and Climate Experiment satellite allows an unprecedented opportunity touse the gravity field to make global comparisons of structures of geological interest.The spatial resolution of the gravity field is sufficiently good to map large-scaleor intracratonic and cratonic basins, as the areal extent of these basins is 0.5 ×106 km2 and greater. We present the gravity anomaly, Bouguer, geoid and terraincorrected geoid fields for a selection of nine large-scale basins and show that thesatellite-derived field can be used to successfully identify distinctive structures of thesebasins, e.g., extinct rifts underlying the basins and generally the isostatic state. Thestudied basins are the Eastern Barents Sea, West Siberian, Tarim, Congo, Michigan,Amazon, Solim ˜ oes, Parnaiba and Paran`a basins. We complete the mapping of thegravity field with a description of the basins in terms of areal extension and depth,sedimentary age and presence and age of volcanism. Interpretation of the satellitegravity anomalies and considerations regarding the crustal thickness as known fromseismic investigations, allows us to conclude that for the greater part of the basinsthere is evidence for high-density material in the lower crust and/or upper mantle.This density anomaly is, at least partly, compensating for the low-density sedimentaryinfill instead of the crustal thinning mechanism. For our selection of basins, crustalthickness variations and Moho topography cannot be considered as mechanisms ofcompensation of the sedimentary loading, which is a clear difference to well-definedrift basins.