162,655 research outputs found
Locating and quantifying the seismic discontinuities in a complex medium through the migration and AVA analysis of reflected and converted waves: an application to the Mt Vesuvius volcano
No full textP-wave arrival time inversion by using the tau-p method: Application to the Mt Vesuvius volcano, southern Italy
No full textIn this paper we have applied a tau - p inversion method based on a non linear approach to a set of first P-arrival times from a 2-D active seismic experiment performed at Mt. Vesuvius in 1994. The initial seismic investigation is devoted to the study of the shallow structure and the tau - p method has been used for modelling velocity variations of a spherically concentric medium which is a better approximation than a flat layer of the Vesuvius geometry. We are able to obtain detailed 1-D velocity models along different specified sections of the recorded seismic line. These sections span different depth ranges and indicate strong lateral and vertical P-velocity variations in the first 1 km of the volcano structure with values ranging from about 1.5 km/s at the surface to 3.5-4.0 km/s at depth. The average 1-D concentric model obtained in this study call be used as a reasonable starting model for iterative high-resolution tomographies of Vesuvius velocity structures
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Locating and quantifying the seismic discontinuities in a complex medium through the migration and AVA analysis of reflected and converted waves : an application to the Mt Vesuvius volcano
No full textGeophysical Journal International, v. 152, n. 2, p. 486-496, 2003. http://dx.doi.org/10.1046/j.1365-246X.2003.01864.xInternational audienc
Finite-Difference Frequency-Domain Modeling of Acoustic Wave Propagation in 2D TTI Anisotropic Media
No full textInternational audienceP323 Finite-Difference Frequency-Domain Modeling of Acoustic Wave Propagation in 2D TTI Anisotropic Media M. Grini* (Géosciences Azur - CNRS) A. Ribodetti (Géosciences Azur - IRD) J. Virieux (Géosciences Azur - UNSA) & S. Operto (Geosciences Azur - CNRS) SUMMARY We present a 2D finite-difference frequency-domain method for modeling acoustic wave propagation in TTI media. The numerical method relies on a parsimonious staggered-grid method implemented in the frequency domain. Discretization of the differential operators is performed along 45° rotated directions. We applied this discretization strategy to the anisotropic acoustic wave equation for TTI media derived by Zhou (2006). The finite-difference stencil ..
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