High‐pressure mineral assemblage in granitic rocks from continental units,Alpine Corsica,France     

Alessandro Malasoma  Michele Marroni  Giovanni Musumeci  Luca Pandolfi 《Geological Journal》2006,41(1):49-59

The Popolasca–Francardo area of northern Corsica contains an assemblage of continental tectonic units affected by an Alpine deformation. In one of these units, Unit II, previously regarded as weakly metamorphosed, a metamorphic mineral assemblage characterized by sodic amphibole, phengite, quartz, albite and epidote has been found in an aplite dyke that cuts the dominant granitoids. Peak‐metamorphic temperature and pressure conditions of 300–370°C and 0.50–0.80 GPa, respectively, have been determined. This finding indicates that a continuous belt of continental slices, characterized by high‐pressure, low‐temperature metamorphism of Tertiary age, extends from the Tenda Massif in the north to the Corte area in the south, thus placing additional constraints on the tectonic evolution of Alpine Corsica. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

Improving ShakeMap performance by integrating real with synthetic data: tests on the 2009 M w?=?6.3 L’Aquila earthquake (Italy)     

Luca Moratto  Angela Saraò 《Journal of Seismology》2012,16(2):131-145

The ShakeMap software automatically generates maps of the peak ground motion parameters (shakemaps) and of instrumental intensity soon after an earthquake. Recorded data are fundamental to obtaining accurate results. In case observations are not available, ShakeMap relies on ground motion predictive equations, but due to unmodelled site conditions or finite fault effects, large uncertainties may appear, mainly in the near-source area where damage is relevant. In this paper, we aim to account for source effects in ShakeMap by computing synthetics to be used for integrating observations and ground motion predictive equations when near-source data are not available. To be effective, the computation of synthetics, as well as of the finite fault, should be done in near real time. Therefore, we computed rapid synthetic seismograms, by a stochastic approach, including the main fault features that were obtained through inversion of regional and teleseismic data. The rapidity of calculation is linked to a number of assumptions, and simplifications that need testing before the procedure can run in automatic mode. To assess the performance of our procedure, we performed a retrospective validation analysis considered as case study of the M _w = 6.3 earthquake, which occurred in central Italy on April 6, 2009. In that case, the first shakemaps, generated a few minutes after the earthquake, suffered large uncertainties on ground motion estimates in an area closer to the epicenter due to the lack of near-field data. To verify our approach, we recomputed shakemaps for the L’Aquila earthquake, integrating data available soon after the earthquake at different elapse times with synthetics, and we compared our shaking map with the final shakemap, obtained when all the data were available. Our analysis evidences that (1) when near-source data are missing, the integration of real data with synthetics reduces discrepancies between computed and actual ground shaking maps, mainly in the near-field zone where the damage is relevant and (2) the approach that we adopted is promising in trying to reduce such discrepancies and could be easily implemented in ShakeMap, but some a priori calibration is necessary before running in an automatic mode.  相似文献   

Periodic orbits accumulating onto elliptic tori for the (<Emphasis Type="Italic">N</Emphasis> + 1)-body problem     

Luca Biasco  Federico Coglitore 《Celestial Mechanics and Dynamical Astronomy》2008,101(4):349-373

We prove the existence of infinitely many periodic solutions, with larger and larger minimal period, accumulating onto elliptic invariant tori for (an “outer solar-system” model of) the planar (N + 1)-body problem.   相似文献   

Geodetic GPS-based analysis of recent crustal motions in Victoria Land (Antarctica)   总被引：1，自引：0，他引：1  

Antonio Zanutta  Luca Vittuari  Stefano Gandolfi   《Global and Planetary Change》2008,62(1-2):115-131

GPS measurements were collected within the framework of the VLNDEF (Victoria Land Network for DEFormation control) project, which was started in 1999 with the aim of detecting crustal deformation in Northern Victoria Land (Antarctica). The network was established in 1999 and is composed of one permanent station (TNB1), which has been observing since 1998, and 28 periodically surveyed control points. Three complete campaigns and some partial surveying of the network have been carried out to date.Data processing and analysis have been performed using an undifferenced approach for the network position within the ITRF. A double-differences-based strategy has been applied for movement detection. The data processing and analysis of results have been carried out for all available data, both periodically acquired and long time series.GPS measurements collected between December 1999 and February 2006 indicate a mean “absolute” motion of the region of v_e = 11.3 mm/yr and v_n = − 11.1 mm/yr and rock uplift rates of v_u = 2.8 mm/yr. These values are consistent with Antarctic plate motion and the general postglacial rebound models of the region. The relative motions within VLNDEF are small and only few points show velocities greater than the confidence levels.  相似文献   

On the dynamical origin of the ICM metallicity evolution     

Sofia A. Cora  Luca Tornatore  Paolo Tozzi  Klaus Dolag 《Monthly notices of the Royal Astronomical Society》2008,386(1):96-104

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Optical emission from massive donors in ultraluminous X-ray source binary systems     

Alessandro Patruno  Luca Zampieri 《Monthly notices of the Royal Astronomical Society》2008,386(1):543-552

We present evolutionary tracks of binary systems with high-mass companion stars and stellar-through-intermediate mass black holes (BHs). Using Eggleton's stellar evolution code, we compute the luminosity produced by accretion from the donor during its entire evolution. We compute also the evolution of the optical luminosity and colours of the binary system taking the disc contribution and irradiation effects into account. The calculations presented here can be used to constrain the properties of the donor stars in ultraluminous X-ray sources by comparing their position on the Hertzsprung–Russell or colour–magnitude diagrams with the evolutionary tracks of massive BH binaries. This approach may actually provide interesting clues also on the properties of the binary system itself, including the BH mass. We found that, on the basis of their position on the colour–magnitude diagram, some of the candidate counterparts considered can be ruled out and more stringent constraints can be applied to the donor masses.  相似文献   

Retrieving the Stress Field Within the Campi Flegrei Caldera (Southern Italy) Through an Integrated Geodetical and Seismological Approach     

Luca D’Auria  Bruno Massa  Elena Cristiano  Carlo Del Gaudio  Flora Giudicepietro  Giovanni Ricciardi  Ciro Ricco 《Pure and Applied Geophysics》2015,172(11):3247-3263

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Geohazards Monitoring in Roma from InSAR and In Situ Data: Outcomes of the PanGeo Project   总被引：1，自引：0，他引：1  

Valerio Comerci  Eutizio Vittori  Carlo Cipolloni  Pio Di Manna  Luca Guerrieri  Stefania Nisio  Claudio Succhiarelli  Maria Ciuffreda  Erika Bertoletti 《Pure and Applied Geophysics》2015,172(11):2997-3028

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Effects of the filtering action exerted by piles on the seismic response of RC frame buildings     

Luca de Sanctis  Raffaele Di Laora  Nicola Caterino  Giuseppe Maddaloni  Stefano Aversa  Alessandro Mandolini  Antonio Occhiuzzi 《Bulletin of Earthquake Engineering》2015,13(11):3259-3275

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Comparison of seismic analysis methods applied to a historical church struck by 2009 L’Aquila earthquake     

Yohei Endo  Luca Pelà  Pere Roca  Francesca da Porto  Claudio Modena 《Bulletin of Earthquake Engineering》2015,13(12):3749-3778

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