http://hdl.handle.net/2122/207 Tue, 21 May 2013 04:09:39 GMT 2013-05-21T04:09:39Z http://hdl.handle.net/2122/8658 Title: The Earth Expansion Evidence – A Challenge for Geology, Geophysics and Astronomy Authors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Boschi, E.; University of Bologna; Cwojdzinski, S.; Polish Geological Survey Editors: Scalera, Giancarlo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Boschi, Enzo; University of Bologna; Cwojdzinski, Stefan; Polish Geological Survey Fri, 30 Nov 2012 23:00:00 GMT http://hdl.handle.net/2122/8658 2012-11-30T23:00:00Z http://hdl.handle.net/2122/8655 Title: Distensional Mediterranean and World Orogens - Their Possible Bearing to Mega-Dykes Active Rising Authors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Editors: Scalera, Giancarlo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Boschi, Enzo; University of Bologna; Cwojdzinski, Stefan; Polish Geological Survey Abstract: An overview of the modern progresses of the expanding Earth conceptions as they come out from new data and their possible interpretations is provided in this paper. The starting point of this review is the new detailed 3D distributions of relocated hypocenters laying under orogenic belts. The similarity of the hypocentral patterns under the Tethyan orogenic belts, and under the South American Pacific orogenic margin is considered to be a major font of information on which to build a more realistic global geodynamic model. Clusters and filaments of hypocenters are recognizable instead of regular patterns. These clusters taper downwards, leading to the idea of a deep origin in narrow regions of disturbance, besides other important facts that witness in favour of surfaceward movements of deep material along what can be called "mega-dykes". The outpouring of the material on the surface produces gravitational nappes and their overthrust on the sediments of the preexisting trough, forcing them on a burial path which emulate the subduction process, but without reaching depths greater than 50-70 km. Phenomenons like metamorphism, mixing, migmization, upward transport of fragments of the buried lithosphere etc. are possible at the boundary between uplifting material and down-pushed crust and lithosphere. Additional clues can be collected that confirm the new proposed framework. The astronomical indications of a coseismic displacement of the instantaneous Earth’s rotation axis in the occasion of the great Sumatra (Mw=9.3) and Honshu (Mw=9.0) earthquakes are especially significant because in complete disagreement with the plate tectonics modelled axis shift and in agreement with the shift expected in the new conception. Because of analogous opposite predictions of the length of day variation following the extreme magnitude earthquakes (ΔLOD<0 vs ΔLOD>0), future improvements of the time measurement techniques could allow a final choice between rival geodynamical models. Fri, 30 Nov 2012 23:00:00 GMT http://hdl.handle.net/2122/8655 2012-11-30T23:00:00Z http://hdl.handle.net/2122/8375 Title: Dispositivo di calibrazione per il digitalizzatore della Grotta Gigante Authors: Spinelli, Giuseppe; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Benedetti, Paolo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Braitemberg, Carla; Dipartimento di GeoScienze, Università di Trieste; Romeo, Giovanni; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Taccetti, Quintilio; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia Abstract: aggiornamento dispositivo di calibrazione per l'acquisizione digitale dati dei pendoli della grotta gigante Mon, 05 Nov 2012 23:00:00 GMT http://hdl.handle.net/2122/8375 2012-11-05T23:00:00Z http://hdl.handle.net/2122/8350 Title: LA STAZIONE GEOFISICA IPOGEA DELLA GROTTA GIGANTE (CARSO TRIESTINO) Authors: Braitenberg, Carla; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Zadro, Maria; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Nagy, Ildikò; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Grillo, Barbara; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Tenze, Daniele; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Mariani, Patrizia; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Zidarich, Sergio Zidarich; Dipartimento di Geoscienze, Università di Trieste (DIGeo, ex DST); Romeo, Giovanni; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Taccetti, Quintilio; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia; Spinelli, Giuseppe; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Benedetti, Paolo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Abstract: aggiornamento sul dispositivo di calibrazione dell’acquisizione digitale dati dei pendoli della Grotta Gigante. Thu, 25 Oct 2012 22:00:00 GMT http://hdl.handle.net/2122/8350 2012-10-25T22:00:00Z http://hdl.handle.net/2122/8322 Title: Distensional Mediterranean and World Orogens Authors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Editors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Cwojdzinski, S. Abstract: An overview of the modern progresses of the expanding Earth conceptions as they come out from new data and their possible interpretations is provided in this paper. The starting point of this review is the new detailed 3D distributions of relocated hypocenters laying under orogenic belts. The similarity of the hypocentral patterns under the Tethyan orogenic belts, and under the South American Pacific orogenic margin is considered to be a major font of information on which to build a more realistic global geodynamic model. Clusters and filaments of hypocenters are recognizable instead of regular patterns. These clusters taper downwards, leading to the idea of a deep origin in narrow regions of disturbance, besides other important facts that witness in favour of surfaceward movements of deep material along what can be called "mega-dykes". The outpouring of the material on the surface produces gravitational nappes and their overthrust on the sediments of the preexisting trough, forcing them on a burial path which emulate the subduction process, but without reaching depths greater than 50-70 km. Phenomenons like metamorphism, mixing, migmization, upward transport of fragments of the buried lithosphere etc. are possible at the boundary between uplifting material and down-pushed crust and lithosphere. Additional clues can be collected that confirm the new proposed framework. The astronomical indications of a coseismic displacement of the instantaneous Earth’s rotation axis in the occasion of the great Sumatra (Mw=9.3) and Honshu (Mw=9.0) earthquakes are especially significant because in complete disagreement with the plate tectonics modelled axis shift and in agreement with the shift expected in the new conception. Because of analogous opposite predictions of the length of day variation following the extreme magnitude earthquakes (ΔLOD<0 vs ΔLOD>0), future improvements of the time measurement techniques could allow a final choice between rival geodynamical models. Sat, 31 Dec 2011 23:00:00 GMT http://hdl.handle.net/2122/8322 2011-12-31T23:00:00Z http://hdl.handle.net/2122/7746 Title: South American Volcanoes and Great Earthquakes Authors: Scalera, Giancarlo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Editors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Abstract: (extended abstract) Mon, 03 Oct 2011 22:00:00 GMT http://hdl.handle.net/2122/7746 2011-10-03T22:00:00Z http://hdl.handle.net/2122/7744 Title: Extended abstracts book of the Workshop ‘The Earth Expansion Evidence’ 37th Interdisciplinary Workshop of the International School of Geophysics Authors: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Cwojdzinski, S.; Polish Geological Survey Editors: Scalera, Giancarlo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Cwojdzinski, Stefan; Polish Geological Survey Abstract: It is a collection of extended abstracts Mon, 03 Oct 2011 22:00:00 GMT http://hdl.handle.net/2122/7744 2011-10-03T22:00:00Z http://hdl.handle.net/2122/6728 Title: Geometrical and physical properties of the 1982-84 deformation source at Campi Flegrei - Italy Authors: Bonafede, M.; Department of Physics, Section of Geophysics, University of Bologna, Italy; Trasatti, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Giunchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Berrino, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia Abstract: Deformation of the ground surface in volcanic areas is generally recognized as a reliable indicator of unrest, possibly resulting from the intrusion of fresh magma within the shallow rock layers. The intrusion process is usually represented by a deformation source such as an ellipsoidal pressurized cavity, embedded within a homogeneous and elastic half-space. Similar source models allow inferring the depth, the location and the (incremental) volume of the intrusion, which are very important parameters for volcanic risk implications. However, assuming a homogeneous and elastic rheology and, assigning a priori the shape and the mechanism of the source (within a very restricted “library” of available solutions) may bias considerably the inference of source parameters. In complete generality, any point source deformation, including overpressure sources, may be described in terms of a suitable moment tensor, while the assumption of an overpressure source strongly restricts the variety of allowable moment tensors. In particular, by assuming a pressurized cavity, we rule out the possibility that either shear failure may precede magma emplacement (seismically induced intrusion) or may accompany it (mixed tensile and shear mode fracture). Another possibility is that a pre-existent weakness plane may be chosen by the ascending magma (fracture toughness heterogeneity). We perform joint inversion of levelling and EDM data (part of latter are unpublished), collected during the 1982-84 unrest at Campi Flegrei caldera: a 43% misfit reduction is obtained for a general moment source if the elastic heterogeneities computed from seismic tomography are accouted for. The inferred source is at 5.2 km depth but cannot be interpreted as a simple pressurized cavity. Moreover, if mass conservation is accounted for, magma emplaced within a shallow source must come from a (generally deeper) reservoir, which is usually assumed to be deep enough to be simply neglected. At Campi Flegrei, seismic tomography indicates that the “deep” magma source is rather shallow (at 7-8 km depth), so that its presence should be included in any thorough attempt to source modeling. Taking into account a deflating source at 7.5 km depth (represented either as a horizontal sill or as an isotropic cavity) and an inflating moment source, the fit of both levelling and EDM data improves further (misfit reduction 80%), but still the best fitting moment source (at 5.5 km depth) falls outside the range of pressurized ellipsoidal cavities. The shallow moment source may be decomposed in a tensile and a shear dislocation. No clue is obtained that the shear and the tensile mechanisms should be located in different positions. Our favourite interpretation is in terms of a crack opening in mixed tensile and shear mode, as would be provided by fluid magma unwelding pre-stressed solid rock. Although this decomposition of the source is not unique, the proposed solution is physically motivated by the minimum overpressure requirement. An important implication of this new interpretation is that the magma emplaced in the shallow moment source during the 1982-84 unrest was not added to already resident magma at the same position. Thu, 31 Dec 2009 23:00:00 GMT http://hdl.handle.net/2122/6728 2009-12-31T23:00:00Z http://hdl.handle.net/2122/4060 Title: Effects of transient water mass redistribution associated with a tsunami wave on Earth’s pole path Authors: Pisani, A. R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Piersanti, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Melini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Piatanesi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Soldati, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia Abstract: We have quantified the effects of a water mass redistribution associated with the propagation of a tsunami wave on the Earth’s pole path and on the Length-Of-Day (LOD) and applied our modeling results to the tsunami following the 2004 giant Sumatra earthquake. We compared the result of our simulations on the instantaneous rotational axis variations with the preliminary instrumental evidence on the pole path perturbation (which has not been confirmed) registered just after the occurrence of the earthquake. The detected perturbation in the pole path showed a step-like discontinuity that cannot be attributed to the effect of a seismic dislocation. Our results show that the tsunami induced instantaneous rotational pole perturbation is indeed characterized by a step-like discontinuity compatible with the observations but its magnitude is almost one hundred times smaller than the detected one. The LOD variation induced by the water mass redistribution turns out to be not significant because the total effect is smaller than current measurements uncertainties. Sun, 30 Sep 2007 22:00:00 GMT http://hdl.handle.net/2122/4060 2007-09-30T22:00:00Z http://hdl.handle.net/2122/3926 Title: I Moti e la Forma della Terra (contents) Authors: Scalera, G. Abstract: No abstract Thu, 31 Dec 1998 23:00:00 GMT http://hdl.handle.net/2122/3926 1998-12-31T23:00:00Z