Stresses induced by loading of an artificial basin     

E. Bozzo  C. Eva  V. Pasquale 《Tectonophysics》1985,117(1-2)

Geomagnetic effects related to the stresses induced by the water load of the Chiotas reservoir (NW Italy) were studied, with measurements of the geomagnetic field at different stages of filling. The highest effect, mean 7 nT, was recorded at three-quarters full; subsequently, as the volume of water increased, the anomalous variations fell to about 2 nT.  相似文献   

Sedimentation rates and subsidence in the Southern Tyrrhenian Basin     

V. Pasquale  P. Chiozzi  M. Verdoya 《Marine Geophysical Researches》2006,27(3):155-165

The petrophysical properties of sediment drill core samples recovered from the Sardinian margin and the abyssal plain of the Southern Tyrrhenian Basin were used to estimate the downhole change in porosity and rates of deposition and mass accumulation. We calculated how the deposited material has changed its thickness as a function of depth, and corrected the thickness for the compaction. The corresponding porosity variation with depth for terrigenous and pelagic sediments and evaporites was modelled according to an exponential law. The mass accumulation rate for the Plio-Quaternary is on average 4.8×10⁴ kg m⁻² my⁻¹ on the Sardinian margin and for the Pliocene in the abyssal plain. In the latter area, the Quaternary attains its greatest thickness and a mass accumulation rate of 11–40×10⁴ kg m⁻² my⁻¹. The basement response to sediment loading was calculated with Airy-type backstripping. On the lower part of the Sardinian margin, the basement subsidence rate due to sediment loading has decreased from a value of 300 m my⁻¹ in the Tortonian and during the Messinian salinity crisis (7.0–5.33 Ma) to about 5 m my⁻¹ in the Plio-Quaternary. In contrast, on the abyssal plain this rate has changed from 8–50 m my⁻¹ during the period 3.6–0.46 Ma, to 95–130 m my⁻¹ since 0.46 Ma, with the largest values in the Marsili Basin. The correlation between age and the depth to the basement corrected for the loading of the sediment in the ocean domain of the Tyrrhenian Basin argues for a young age of basin formation.  相似文献   

The two-component afterglow of Swift GRB 050802     

S. R. Oates  M. De Pasquale  M. J. Page  A. J. Blustin  S. Zane  K. McGowan  K. O. Mason  T. S. Poole  P. Schady  P. W. A. Roming  K. L. Page  A. Falcone  N. Gehrels 《Monthly notices of the Royal Astronomical Society》2007,380(1):270-280

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Three-dimensional kinematic depth migration of converted waves: application to the 2002 Molise aftershock sequence (southern Italy)   总被引：1，自引：0，他引：1  

Diana Latorre  Pasquale De Gori  Claudio Chiarabba  Alessandro Amato  Jean Virieux  Tony Monfret 《Geophysical Prospecting》2008,56(4):587-600

Migration techniques, currently used in seismic exploration, are still scarcely applied in earthquake seismology due to the poor source knowledge and sparse, irregular acquisition geometries. At the crustal scale, classical seismological studies often perform inversions based on the arrival time of primary phases (P- and S-waves) but seldom exploit other information included in seismic records. Here we show how migration techniques can be adapted to earthquake seismology for converted wave analysis. As an example, we used data recorded by a dense local seismic network during the 2002 Molise aftershock sequence. In October and November 2002, two moderate magnitude earthquakes struck the Molise region (southern Italy), followed by an aftershock sequence lasting for about one month. Local earthquake tomography has provided earthquake hypocenter locations and three-dimensional models of P and S velocity fields. Strong secondary signals have been detected between first-arrivals of P- and S-waves and identified as SP transmitted waves. In order to analyse these waves, we apply a prestack depth migration scheme based on the Kirchhoff summation technique. Since source parameters are unknown, seismograms are equalized and only kinematic aspects of the migration process are considered. Converted wave traveltimes are calculated in the three-dimensional (3D) tomographic models using a finite-difference eikonal solver and back ray tracing. In the migrated images, the area of dominant energy conversion corresponds to a strong seismic horizon that we interpreted as the top of the Apulia Carbonate Platform and whose geometry and position at depth is consistent with current structural models from existing commercial seismic profiles, gravimetric and well data.  相似文献   

Diffraction of random wind-generated waves by detached breakwater or breakwater gap     

Pasquale Filianoti 《Ocean Engineering》2000,27(11):551

The diffraction coefficient in some areas of the geometric shadow behind a detached breakwater or a breakwater gap proves to be markedly greater for random wind-generated waves than for periodic waves. The cause becomes clear in the light of the general theory of three-dimensional wave groups, which shows how some exceptionally large wave heights can occur in the geometric shadow.  相似文献   

Photometric calibration of the Swift ultraviolet/optical telescope     

T. S. Poole  A. A. Breeveld  M. J. Page  W. Landsman  S. T. Holland  P. Roming  N. P. M. Kuin  P. J. Brown  C. Gronwall  S. Hunsberger  S. Koch  K. O. Mason  P. Schady  D. Vanden Berk  A. J. Blustin  P. Boyd  P. Broos  M. Carter  M. M. Chester  A. Cucchiara  B. Hancock  H. Huckle  S. Immler  M. Ivanushkina  T. Kennedy  F. Marshall  A. Morgan  S. B. Pandey  M. de Pasquale  P. J. Smith  M. Still 《Monthly notices of the Royal Astronomical Society》2008,383(2):627-645

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Seismic performance assessment of masonry structures with a modified “concrete” model     

Alberto Maria Avossa  Pasquale Malangone 《Bulletin of Earthquake Engineering》2015,13(9):2693-2718

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Types of crust beneath the Ligurian Sea     

V. Pasquale  M. Verdoya  P. Chiozzi 《地学学报》1994,6(3):255-266

The structural setting beneath the Ligurian Sea resuJts from several tectonic events reflected in the nature of the crust. The central-western sector, called the Ligurian basin, is part of the northwestern Mediterranean. It is a marginal basin that was generated in Oligocene-Miocene time by subduction of the Adriatic plate beneath the European plate and by the eastward drift of the Corsica-Sardinia block. The eastern sector belongs to the Tyrrhenian basin system and is characterized by extensional activity which since Tortonian time superimposed an earlier compressional regime. Our effort has been addressed in particular towards simplifying the complex nature of the crust of the Ligurian basin by modelling its genesis using uniform extension and sea-floor depth variation with age. In the rift stage of the basin's evolution, the initial subsidence reaches the isostatic equilibrium level of the asthenosphere by a thinning factor of 3.15. The additional passive process, corresponding to the cooling of the lithosphere since 21 Ma, leads to a total tectonic subsidence of 3.4 km, representing the boundary of the extended continental crust. For values up to 4.1 km a transitional-type crust is expected, whereas for higher tectonic subsidence values a typical oceanic crust should exist. After setting these constraints, the boundaries of the different crust types have been drawn based on total tectonic subsidence observations deduced from bathymetry and post-rift sediment thickness. Although there is a general agreement with the previous reconstructions deduced from other experimental data, the oceanic realm has wider extent and more complex shape. The northernmost part of this realm shows crust of sub-oceanic type altemating basement highs with lower subsidence values. The observed surface heat flux is consistent with the predicted geothermal held in the Alpine-Provençal continental margin and in the oceanic domain. However, a characteristic thermal asymmetry is clearly visible astride the basin, due to the enhanced heat flux of the Corsica margin. Even if the uniform extension model accounts well at a regional level for the present basement depth, a remarkable tectonic subsidence excess has been found in the Alpine-Provençal continental margin. This evidence agrees with the reprise in compression of the margin; the direction of the greatest principal stress is N120°E on average.  相似文献   

Earth and Mars: early thermal profiles     

Angioletta Coradini  Costanzo Federico  Pasquale Lanciano 《Physics of the Earth and Planetary Interiors》1983,31(2):145-160

The extent of formation heating for the Earth and Mars has been evaluated assuming that the terrestrial planets accumulated from planetesimals. The main result is that, even if a long accumulation time is assumed (τ ≥ 100 Ma), it is possible to obtain a planetary structure with a large melted shell taking into account the role played by massive projectiles, which, upon reaching depths of several kilometres, are able to deposit heat significantly below the planetary surface. Internal temperatures, sufficient for the downward migration of the liquid iron alloy, have been obtained.  相似文献