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  • Moho  (3)
  • Body waves  (2)
  • Am. Geophys. Un.  (3)
  • Oxford University Press  (2)
  • American Chemical Society
  • American Institute of Physics (AIP)
  • Nature Publishing Group
  • Periodicals Archive Online (PAO)
  • 2020-2023  (2)
  • 1990-1994  (1)
  • 1975-1979  (2)
  • 1955-1959
Collection
Publisher
Years
  • 2020-2023  (2)
  • 1990-1994  (1)
  • 1975-1979  (2)
  • 1955-1959
  • 2015-2019  (3)
Year
  • 1
    Publication Date: 2022-09-01
    Description: In the last years the scientific literature has been enriched with new models of the Moho depth in the Antarctica Continent derived by the seismic reflection technique and refraction profiles, receiver functions and seismic surface waves, but also by gravimetric observations over the continent. In particular, the gravity satellite missions of the last two decades have provided data in this remote region of the Earth and have allowed the investigation of the crust properties. Meanwhile, other important contributions in this direction has been given by the fourth International Polar Year (IPY, 2007–2008) which started seismographic and geodetic networks of unprecedented duration and scale, including airborne gravimetry over largely unexplored Antarctic frontiers. In this study, a new model for the Antarctica Moho depths is proposed. This new estimation is based on no satellite gravity measures, thanks to the availability of the gravity database ANTGG2015, that collects gravity data from ground-base, airborne and shipborne campaigns. In this new estimate of the Moho depths the contribution of the gravity measures has been maximized reducing any correction of the gravity measures and avoiding constraints of the solution to seismological observations and to geological evidence. With this approach a pure gravimetric solution has been determined. The model obtained is pretty in agreement with other Moho models and thanks to the use of independent data it can be exploited also for cross-validating different Moho depths solutions.
    Description: Published
    Description: 1404–1420
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Antarctica ; Moho ; Gravity inversion ; Collocation ; ANTGG2015
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2021-12-15
    Description: This article has been accepted for publication in Geophysical Journal International ©: The Authors 2022. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Uploaded in accordance with the publisher's self-archiving policy.
    Description: To understand the seismotectonics and the seismic hazard of the study sector of the Northern Apennines (Italy), one of the most important earthquakes of magnitude Mw = 6.5 which struck the Lunigiana and Garfagnana areas (Tuscany) on 7 September 1920 should be studied. Given the early instrumental epoch of the event, neither geometric and kinematic information on the fault-source nor its fault-plane solution were available. Both areas were candidates for hosting the source fault and there was uncertainty between a normal fault with Apenninic direction or an anti-Apenninic strike-slip. We retrieved 11 focal parameters (including the fault-plane solution) of the 1920 earthquake. Only macroseismic intensity information (from 499 inhabited centres) through the KF-NGA inversion technique was used. This technique uses a Kinematic model of the earthquake source and speeds up the calculation by a Genetic Algorithm with Niching. The result is a pure dip-slip focal solution. The intrinsic ambiguities of the KF-NGA method (±180° on the rake angle; choice of the fault plane between the two nodal planes) were solved with field and seismotectonic evidence. The earthquake was generated by a normal fault (rake angle = 265° ± 8°) with an Apennine direction (114° ± 5°) and dipping 38° ± 6° towards SW. The likely candidate for hosting the source-fault in 1920 is the Compione-Comano fault that borders the NE edge of the Lunigiana graben. The KF-NGA algorithm proved to be invaluable for studying the kinematics of early instrumental earthquakes and allowed us to uniquely individuate, for the first time ever, the seismogenic source of the 1920 earthquake. Our findings have implications in hazard computation and seismotectonic contexts.
    Description: Published
    Description: 1465–1477
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Inverse theory ; Body waves ; Earthquake source observations ; Seismicity and tectonics ; Dynamics: seismotectonics ; Fractures, faults, and high strain deformation zones ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Am. Geophys. Un.
    In:  Bull., Polar Proj. OP-O3A4, Continental Lithosphere: Deep Seismic Reflections, Washington, D.C., Am. Geophys. Un., vol. 22, no. 4, pp. 121-134, (ISBN 0080419208)
    Publication Date: 1991
    Keywords: Body waves ; P-waves ; Shear waves ; Borehole geophys. ; Anisotropy ; Review article ; Luschen ; Soellner ; Sollner ; Meissner ; Duerbaum ; Durbaum
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  • 4
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    Am. Geophys. Un.
    In:  Hannover, Am. Geophys. Un., vol. 20, no. XVI:, pp. 1-14, (ISBN: 1-4020-2968-3)
    Publication Date: 1977
    Keywords: Velocity depth profile ; CRUST ; Velocity depth profile ; Moho ; Geochemistry ; petrology
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  • 5
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    Am. Geophys. Un.
    In:  Bull., Polar Proj. OP-O3A4, The Earth's Crust, Hannover, Am. Geophys. Un., vol. 20, no. Subvol. a, pp. 289-317, (ISBN 0080419208)
    Publication Date: 1977
    Keywords: Review article ; Velocity depth profile ; CRUST ; Modelling ; Velocity depth profile ; Moho ; Geochemistry ; petrology
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