http://hdl.handle.net/2122/207 Ricerca nel canale cerca http://www.earth-prints.org/simple-search http://hdl.handle.net/2122/4060 Titolo: Effects of transient water mass redistribution associated with a tsunami wave on Earth’s pole path<br/><br/>Autori: 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<br/><br/>Abstract: We have quantified the effects of a water mass redistribution associated with the propagation of a tsunami waveon the Earth’s pole path and on the Length-Of-Day (LOD) and applied our modeling results to the tsunami followingthe 2004 giant Sumatra earthquake. We compared the result of our simulations on the instantaneous rotationalaxis variations with the preliminary instrumental evidence on the pole path perturbation (which has notbeen confirmed) registered just after the occurrence of the earthquake. The detected perturbation in the pole pathshowed a step-like discontinuity that cannot be attributed to the effect of a seismic dislocation. Our results showthat the tsunami induced instantaneous rotational pole perturbation is indeed characterized by a step-like discontinuitycompatible with the observations but its magnitude is almost one hundred times smaller than the detectedone. The LOD variation induced by the water mass redistribution turns out to be not significant because thetotal effect is smaller than current measurements uncertainties. Mon, 01 Oct 2007 00:00:00 GMT http://hdl.handle.net/2122/3926 Titolo: I Moti e la Forma della Terra (contents)<br/><br/>Autori: Scalera, G.<br/><br/>Abstract: No abstract Fri, 01 Jan 1999 00:00:00 GMT http://hdl.handle.net/2122/3925 Titolo: I Moti e la Forma della Terra (Third Part)<br/><br/>Autori: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Abstract: No abstract Fri, 01 Jan 1999 00:00:00 GMT http://hdl.handle.net/2122/3924 Titolo: I Moti e la Forma della Terra (Second Part)<br/><br/>Autori: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Abstract: No abstract Fri, 01 Jan 1999 00:00:00 GMT http://hdl.handle.net/2122/3923 Titolo: I Moti e la Forma della Terra (First Part)<br/><br/>Autori: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Abstract: No abstract Fri, 01 Jan 1999 00:00:00 GMT http://hdl.handle.net/2122/1152 Titolo: The expanding Earth: a sound idea for the new millennium<br/><br/>Autori: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Curatori: Scalera, G.; Jacob, K.-H.<br/><br/>Abstract: A short review of the more relevant modern arguments in favour of the conception of the Earth in expansion is provided. The advantage of the expanding planet idea is a common explanationof several outstanding problems coming from palaeontology, palaeomagnetism, geology and climatology. All these problems should be regarded as be a sort of distortion effects, which arise ifwe try to reconstruct the situation of old geologic times adopting the modern Earth’s radius – the distortions become larger and larger as we came back in time. As a consequence the expanding Earth could be considered a natural generalization of the plate tectonic. A strong support to this generalization came from the simple and united explanation that can be found in the expanding Earth of the classical geodynamic phenomena of the polar motion and the true polar wander by an inversion of the paleogeographic position of the triple points. The conviction is expressed that basic information about this old global tectonic conception should be provided in secondary school and university courses. Sat, 01 Mar 2003 00:00:00 GMT http://hdl.handle.net/2122/1150 Titolo: The geodynamic meaning of the great Sumatran earthquake: Inferences from short time windows<br/><br/>Autori: Scalera, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Abstract: The difference between the value of seismic moment computed using the surface wave data and the valuederived from the normal modes of the Earth requires reinterpretation of the focal mechanism of the Great Sumatran Earthquake (TU=26 December 2004 - 00h 58m, Lat=3.3°N, Lon=95.8°E, H=30 km, M=9.3) based on the second conjugate – near vertical CMT fault plane solution. The displacement of the Earth’s instantaneous rotation pole – observed at ASI of Matera, Italy –, the seismic data (USGS) in the two days following the main shock, the high frequency P-wave radiation, the geomorphologic data, and the satellite data of uplift/subsidence of the coasts (IGG) converge toward this interpretation. A thorough revision or a complete overcoming of the subduction concept is then needed. Wed, 01 Jun 2005 00:00:00 GMT http://hdl.handle.net/2122/1134 Titolo: Sumatra earthquake and Earth rotation<br/><br/>Autori: 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; Piatanesi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Melini, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; Soldati, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia<br/><br/>Abstract: The giant earthquake of December 26 2004 off the west coast of northern Sumatra is likely to have affected Earth rotational parameters. A preliminary analysis of data obtained by Satellite Laser Ranging technique evidenced a step discontinuity of (1.5±0.4) mas in the instantaneous pole path in correspondence with the earthquake occurrence. Since a step-like temporal dependence is not compatible with the action of an earthquake on the inertia tensor, we test the hypothesis that the effect isnít due to the excitation associated with the seismic rupture but instead to the water mass redistribution associated with the tsunami occurred after the earthquake. In order to quantify this effect, we used a synthetic numerical tsunami model to compute the excitation function associated with the tsunami wave propagation and therefore we compute the associated variation of the instantaneous pole path. Sun, 02 Apr 2006 00:00:00 GMT