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  • 1
    Electronic Resource
    Electronic Resource
    Equations of state for silicates in the metallic form (1972)
    Springer
    Pure and applied geophysics 101 (1972), S. 5-9 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Sommario Si riesamina il problema della discontinuità tra il mantello ed il nucleo. Per mezzo di equazioni di stato teoriche si conclude che essa non può essere una transizione di fase.
    Notes: Summary We re-examine the problem of the mantle-core discontinuity. By means of theoretical equations of state for silicates in the metallic form, we conclude, once more, that it is a composition discontinuity rather than a phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876769
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  • 2
    Electronic Resource
    Electronic Resource
    Aquifer-induced Seismicity in the Central Apennines (Italy) (1998)
    Springer
    Pure and applied geophysics 153 (1998), S. 179-194 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Induced seismicity, flow rate, water level, preseismic anomalies, aquifer.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —The Gran Sasso chain (Central Apennines, Italy) contains one of the largest aquifers of Central Italy. From 1970–1986 the massif was tunnelled through in order to build up a highway and an international underground laboratory for nuclear physics research. These works have strongly modified the hydrogeological situation of the chain, as shown by the decrease in flow rate that occurred in many springs located at the border of the carbonatic structure, along the boundary between the permeable limestone of the massif and the surrounding aquicludes. The analysis of the seismicity (M≥ 3.0) that occurred in the Gran Sasso area from 1956 to 1995 suggests that after the tunnelling works both the number of earthquakes has increased and epicenters have migrated, gathering at the northwestern border zone. The foremost events which occurred in this zone in recent years took place on May 5, 1992 (M = 3.1), August 25, 1992 (M = 3.9) and March 13, 1994 (M = 3.5). The flow rate data of four springs and water level data of an underground karst pool located at the border of the carbonatic structure of the massif show clear anomalies before the occurrence of the quoted earthquakes. Regardless, these anomalies can be explained by the rapid melting of the thick mantle of snow on the Gran Sasso chain, due to sudden increases of mean temperatures. In this paper we present and discuss the possibility that the quoted earthquakes are induced by the irregular variations of the Gran Sasso aquifer, evidenced by the quoted anomalies in the flow rate and water level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050191
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  • 3
    Electronic Resource
    Electronic Resource
    A new dissipation model based on memory mechanism (1971)
    Springer
    Pure and applied geophysics 91 (1971), S. 134-147 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The model of dissipation based on memory introduced by Caputo is generalized and checked with experimental dissipation curves of various materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00879562
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  • 4
    Electronic Resource
    Electronic Resource
    Automatic equipment to monitor groundwater radon (1993)
    Springer
    Pure and applied geophysics 141 (1993), S. 125-137 
    Details
    ISSN: 1420-9136
    Keywords: Automatic equipment ; groundwater radon ; environment ; earthquake precursors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Prototype instrumentation, able to automatically measure groundwater radon content variations, is presented. The equipment is made of stainless steel and has spherical valves with automatic and pneumatic control. The deemanation of the gases from the water is obtained by evacuating a suitable expansion chamber. The instrumentation can make discrete sampling ranging from 1 per hour to 1 per 99 hours. The equipment was tested in the laboratory: the efficiency was measured by means of a266Ra solution. A mean value of (0.65±0.07) count/s/Bq was obtained. A calibration test was carried out by comparing countings from the automatic equipment with those obtained by the standard laboratory cell. Results of an operational check over a period of approximately one year indicate that variations in radon at the calibration site are attributable more to meteorological than to tectonic causes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00876239
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  • 5
    Electronic Resource
    Electronic Resource
    Possible creep-related tilt precursors obtained in the Central Apennines (Italy) and in the Southern Caucasus (Georgia) (1995)
    Springer
    Pure and applied geophysics 144 (1995), S. 277-300 
    Details
    ISSN: 1420-9136
    Keywords: Fault creep ; ground tilt ; earthquake precursors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Daily averaged tilt component data from two sites of the Central Apennines (Italy) and of the Southern Caucasus (Georgia), respectively, revealed intermediate-term tilts as possible precursors to earthquakes (M=3.0÷4.7) which occurred in the above-mentioned seismic areas within a distance of 50 km from the sites. A good temporal correlation as well as a fair spatial correspondence between these residual tilts (with amplitude and duration of some microradians and months, respectively) and main shocks were pointed out, by removing both secular trends and seasonal thermoelastic effects from the raw tilts. An attempt was made to justify the above-mentioned results, based on the assumption that the observed intermediate-term preseismic tilts are the manifestation of aseismic creep episodes of comparable duration in the fault materials of thrust faults close to the tilt sites. The mechanism refers to a strain field slowly propagating from the preparation focal area to the tilt site, through crustal blocks separated by weak transition zones. This propagation is thought to be the cause of the local aseismic fault slip recorded by the tiltmeters. Previously, both discrete structures and strain propagation effects were revealed in the Central Apennines and are thought also to exist in the Southern Caucasus. As in the past, the rheological properties of fault materials are revealed as viscoelastic ones. In fact, creep equations obtained by applying several viscoelastic models on our data, proved to fit quite well some of the observed tilt precursors, producing viscosity and rigidity values very similar to those reported in literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878635
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  • 6
    Electronic Resource
    Electronic Resource
    A procedure for the calibration of gravimeters (1956)
    Springer
    Pure and applied geophysics 35 (1956), S. 8-13 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary Taking into account some recent results showing that the observations carried out with Worden gravimeters are influenced by temperature, a method of calibration has been followed which aims to neutralize both the effect of drift and to affort complete symmetry to every value observed.
    Abstract: Résumé En tenant compte de récents resultats qui montrent comme les lectures faites avec les gravimètres Worden soient influencées par la température, on a suivi pour l'étalonnage de ces gravimètres une méthode qui a le but outre que de neutralizer l'effet de la derive, d'assurer la complète symétrie aux valeurs observées.
    Notes: Riassunto Tenendo conto dei risultati di alcune recenti ricerche che mostrano come le letture fatte ai gravimetri Worden siano influenzate dalla temperatura, si è seguito un metodo di taratura che ha il duplice scopo di neutralizzare l'effetto della deriva e di trattare con la massima simmetria ogni singolo valore osservato.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02122860
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  • 7
    Electronic Resource
    Electronic Resource
    Resolution of molecular polarizabilities of CH3–X and CH3–CH2–X derivatives into atomic terms (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 4053-4057 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An additive scheme for resolving average molecular electric dipole polarizabilities into atomic contributions, based on the acceleration gauge for the electric dipole, has been applied to a series of methyl and ethyl derivatives, CH3–X and CH3–CH2–X. Extended calculations have been carried out to test the reliability of the partition method. Gross atomic isotropic contributions have been evaluated for carbon, hydrogen, and heteroatoms, showing a good degree of transferability from molecule to molecule. The theoretical values of atomic polarizabilities can be used to predict fairly accurate average polarizabilities of higher homologous molecules in the series of X-substituted alkanes. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343902
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  • 8
    Electronic Resource
    Electronic Resource
    Shielding polarizabilities via continuous transformation of the origin of the current density in the set of small molecules: H2O2, F2, H2C2, H2CO, NH3, HCN, and HNC (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 6141-6151 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A procedure, based on a continuous transformation of the origin of the (quantum mechanical) current density that sets the diamagnetic contribution to zero (CTOCD-DZ ) all over the molecular domain, is applied to determine shielding polarizabilities to first order in a perturbing electric field. In any calculations relying on the algebraic approximation, irrespective of size and quality of the (gaugeless) basis set employed, all the components of the CTOCD-DZ magnetic shielding polarizability are origin independent, and the constraints for charge and current conservation are exactly satisfied. The effects of a static uniform electric field on the nuclear magnetic resonance (NMR) shielding of H2O2, F2, H2C2, H2CO, NH3, HCN, and HNC molecules have been investigated within the CTOCD-DZ method, and compared with the conventional results evaluated via the same basis sets, and with theoretical results taken from the literature. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481215
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  • 9
    Electronic Resource
    Electronic Resource
    The cost-reduction potential of electric-power pools
    Amsterdam : Elsevier
    Economics Letters 18 (1985), S. 387-390 
    Details
    ISSN: 0165-1765
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-1765(85)90059-X
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  • 10
    Electronic Resource
    Electronic Resource
    On the migration of precursors of strong earthquakes (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 4 (1992), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: It is found that perturbations presumedly associated with swarms, the B patterns and the BG pattern precursors of strong earthquakes in New Zealand, California and Apennines, propagate in the crust of the Earth with a velocity of the order of cm1. The hypothesis that a single travelling elastic perturbation causes a set of precursors of the same strong earthquake is discussed and it is concluded that each precursor is associated with a different perturbation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1992.tb00617.x
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