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Falcone, C.
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Falcone, C.
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- PublicationOpen AccessTomographic image of the crust and uppermost mantle of the Ionian and Aegean regions(1997-01)
; ; ; ; ; ; ; ;Alessandrini, B.; Istituto Nazionale di Geofisica, Roma, Italy ;Beranzoli, L.; Istituto Nazionale di Geofisica, Roma, Italy ;Drakatos, G.; National Observatory of Athens, Institute of Geodynamics, Athens, Greece ;Falcone, C.; Istituto Nazionale di Geofisica, Roma, Italy ;Karantonis, G.; National Observatory of Athens, Institute of Geodynamics, Athens, Greece ;Mele, F. M.; Istituto Nazionale di Geofisica, Roma, Italy ;Stavrakakis, G. N.; National Observatory of Athens, Institute of Geodynamics, Athens, Greece; ; ; ; ; ; We present a tomographic view of the crust and uppermost mantle beneath the Central Mediterranean area obtained from P-wave arrival times of regional earthquakes selected from the ISC bulletin. The P-wave velocity anomalies are obtained using Thurber's algorithm that jointly relocates earthquakes and computes velocity adjustments with respect to a starting model. A specific algorithm has been applied to achieve a distribution of epicentres as even as possible. A data set of 1009 events and 49072 Pg and Pn phases was selected. We find a low velocity belt in the crust, evident in the map view at 25 km of depth, beneath the Hellenic arc. A low velocity anomaly extends at 40 km of depth under the Aegean back arc basin. High velocities are present at Moho depth beneath the Ionian sea close to the Calabrian and Aegean arcs. The tomographic images suggest a close relationship between P-wave velocity pattern and the subduction systems of the studied area.240 164 - PublicationRestrictedA simple approach to the transformation of spherical harmonic models under coordinate system rotation(1996)
; ; ; ;De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Torta, J. M.; Observatori de l'Ebre, CSIC, 43520 Roquetes, (Tarragona), Spain ;Falcone, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; The transformation of a set of spherical harmonic coefficients characterizing a model of the geomagnetic field, or a general function defined on a sphere, subject to a rotation of the coordinate system, is given by the direct relations between the coefficients and then by using a numerical approach. The parameters for a pair of such rotations (from one set to another, and vice versa) are given, along with a few examples of their application. The method is particularly useful for the comparison of geophysical characteristics derived from models developed under different coordinate systems. It offers a practical solution to the problem, which can be implemented without difficulty.198 30 - PublicationRestrictedSimple additional constraints on regional models of the geomagnetic secular variation field(1996-10)
; ; ; ;De Santis, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Falcone, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Torta, J. M.; Observatori de I'Ehre, Consejo Superior de Investigationes Cientificas (CSIC), 43520 Roquetes (Tarragona), Spain; ; Standard ways of building regional models of the geomagnetic field fail when one wishes to model secular variation (SV). The reason for this is that the SV is mainly a large-scale feature, while regional modelling is most appropriate for characterizing small-scale features. The new idea presented in this note consists in reducing this effect by requiring that the spatial derivatives of the SV produced by the regional model fit the values given by global (and smoother) models such as the international geomagnetic reference field.194 21 - PublicationOpen AccessRemarks on the mean-square values of the geomagnetic field and its components(1995-05)
; ; ; ;De Santis, A.; Istituto Nazionale di Geofisica, Roma, Italy ;Falcone, C.; Istituto Nazionale di Geofisica, Roma, Italy ;Lowes, F. J.; Physics Department, Univervità of Newcastle, Upton Tyne, U.K.; ; When considering functions on the Earth's (spherical) surface, mean-square values are often used to indicate their (relative) magnitude. If a function is separated into it, (essentially) spherical harmonic components then, provided these individual harmonic components are orthogonal over the surface, the concept of spatial power spectrum can be introduced, with each harmonic contributing separately to the total mean square value; this is true for the geomagnetic field vector B, its horizontal component vector H, and its vertical component z. However, because of the lack of orthogonality this concept is not applicable to the horizontal X and y components individually; problems which arise from this are discussed.181 1212