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two-and-a-half dimensional

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Journal Article
Journal: Geophysics
Published: 01 January 1987
Geophysics (1987) 52 (1): 26-36.
... reflection strength or impedance on each reflector.The algorithms are 'two and one-half dimensional' (2.5-D) in that they incorporate three-dimensional (3-D) wave propagation in a medium which varies in only two dimensions. The use of 3-D sources does not entail any computational penalty, and it avoids...
Journal Article
Published: 01 August 1999
Bulletin of the Seismological Society of America (1999) 89 (4): 903-917.
...Heming Xu; Steven M. Day; Jean-Bernard H. Minster Abstract We examine a staggered pseudospectral method to solve a two-dimensional wave propagation problem with arbitrary nonlinear constitutive equations, and evaluate a general image method to simulate the traction-free boundary condition...
Journal Article
Journal: Geophysics
Published: 01 October 1984
Geophysics (1984) 49 (10): 1800.
...L. Eskola; Edson E. S. Sampaio Abstract In a recent paper Sampaio presented an analytic solution of the magnetic field problem for a circular magnetized cylinder embedded in a homogeneous magnetized half-space. In his paper, Sampaio also stated that the numerical method for solving magnetostatic...
Journal Article
Journal: Economic Geology
Published: 01 March 2012
Economic Geology (2012) 107 (2): 209-228.
...™ spectra are collected in three modules, one covering the visible to near-infrared wavelengths (VNIR: 380–1,000 nm) and two covering the shortwave-infrared (SWIR: 1,000–2,500 nm). The sampling interval of the ASD™ spectrometer is 1.4 nm in the VNIR and 2.0 nm in the SWIR, with a wavelength accuracy of ±1...
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Journal Article
Published: 01 April 1994
Canadian Journal of Earth Sciences (1994) 31 (4): 675-681.
... survey conducted over five profiles on the lake in 1986, the purpose of which was to study the 1.1 Ga Midcontinent Rift under the lake. Two and one-half dimensional (2.5D) magnetic modelling has demonstrated that the model predicted by the seismic results is compatible with the magnetic anomalies under...
Journal Article
Journal: Geophysics
Published: 01 May 1993
Geophysics (1993) 58 (5): 637-644.
... easily adapted to the calculation of anomalies due to two and one-half-dimensional (2.5-D) and three-dimensional (3-D) heterogeneously magnetized sources. GeoRef, Copyright 2005, American Geological Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United...
Journal Article
Journal: Geophysics
Published: 01 October 1988
Geophysics (1988) 53 (10): 1284-1294.
...R. Gerhard Pratt; M. H. Worthington Abstract Previously published equations for diffraction tomography do not solve the 'two and one-half dimensional problem' (point source illumination of two-dimensional geology) if sources and receivers are confined to linear arrays. In spite of this lack...
Journal Article
Journal: Geophysics
Published: 01 June 1995
Geophysics (1995) 60 (3): 784-795.
... which are 3-D points rather than lines. This configuration is denoted as two-and-one-half-dimensional. We present a frequency-domain approach to modeling acoustic wave propagation in such situations which allows correct treatment of point sources but takes advantage of the assumed 2-D nature...
Journal Article
Journal: Geophysics
Published: 01 December 1993
Geophysics (1993) 58 (12): 1726-1738.
... reconstruction algorithm similar to those used in seismic cross-well tomography or medical imaging applications.The technique was demonstrated using ray-theoretic examples to simulate radial variations in slowness. In addition, full-waveforms were generated using two-and-a-half-dimensional (2.5-D) FDM computer...
Journal Article
Journal: Geophysics
Published: 01 February 1992
Geophysics (1992) 57 (2): 245-257.
... deconvolution, and (6) two-and-a-half dimensional (2.5-D) corrections. This preprocessing is designed to enhance scattered P-waves that are used in the inversions.Images obtained from the application of back-propagation and quadratic programming methods to the preprocessed data show possible fracture zones...
Series: GSA Memoirs
Published: 01 January 1989
DOI: 10.1130/MEM172-p405
... compensated topography, and in which the area of interest is modeled using the seismic constraints applied in a two-and-one-half-dimensional geometry, holds promise for exploiting useful features of both the Bouguer and isostatic residual gravity anomalies. ...
Journal Article
Journal: Geophysics
Published: 01 October 1980
Geophysics (1980) 45 (10): 1507-1512.
... of the prism. Equations for the magnetic field due to a similar body were derived by Shuey and Pasquale (1973), who coined the term 'two-and-a-half dimensional' (2 1/2-D) to describe the geometry. Magnetic intensities are expressed as a vector sum, from which the common dot product formulation can be obtained...
Journal Article
Journal: Geophysics
Published: 01 June 1995
Geophysics (1995) 60 (3): 796-809.
... inversion schemes are of limited utility even in 2-D media because they do not model 3-D dynamics correctly. Many seismic experiments effectively assume that the geology varies in two dimensions only but generate 3-D (point source) wavefields; that is, they are 'two-and-one-half-dimensional' (2.5-D...
Journal Article
Published: 28 November 2018
Canadian Journal of Earth Sciences (2018) 56 (5): 433-451.
... gradiometry) which makes Bathurst a unique case. We show data compilation and map view interpretation, followed by two-and-a-half-dimensional (2.5D) gravity and magnetic modelling. From this, we provide constraints on the folded structure of the mafic and felsic volcanic units, and we interpret a large...
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Series: Society of Exploration Geophysicists Open File
Published: 01 January 2001
DOI: 10.1190/1.9781560801771.ch14
EISBN: 9781560801771
... Abstract Numerical implementation of multicomponent true-amplitude Kirchhoff imaging in two and one-half dimensional v(x,z) media, requires the computation of several ray quantities: traveltimes, slowness, polarization vectors, and geometrical spreading. The purpose of this paper is to show...
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Journal Article
Published: 01 June 1994
Canadian Journal of Earth Sciences (1994) 31 (6): 881-890.
... for the area and process them using shaded relief, horizontal and vertical gradient, upward continuation, and layer stripping techniques to interpret the more subtle features of the fields.Traditional two and one-half dimensional gravity and magnetic modelling is undertaken using constraints from...
Journal Article
Published: 01 April 1994
Canadian Journal of Earth Sciences (1994) 31 (4): 722-727.
... this contrast, a two and one-half dimensional model shows that rocks of Tasiuyak domain constitute a triangular prismatic body with maximum thickness of 13 km adjacent to Nain Province, which thins westward to a feather edge. The model is compatible, qualitatively, with the aeromagnetic anomaly and consonant...
Journal Article
Journal: Geophysics
Published: 01 May 1993
Geophysics (1993) 58 (5): 616-625.
... of the azimuthal angle phi ), but the field generated by an off-axis source in this medium is in general a function of rho , phi , and z. This two and a half-dimensional (2.5-D) problem is often encountered in electromagnetic well logging, as well as in other areas such as optical fiber communications...
Journal Article
Journal: Geophysics
Published: 01 September 1991
Geophysics (1991) 56 (9): 1384-1394.
...Wenjie Dong; Mark Jeffrey Emanuel; Phillip Bording; Norman Bleistein Abstract The computer implementation of a two-and-one-half dimensional (2.5-D) constant density prestack inversion formalism with laterally and depth-dependent background propagation speed is a Kirchhoff-type inversion, summing...
Journal Article
Journal: Geophysics
Published: 01 July 1985
Geophysics (1985) 50 (7): 1144-1162.
...William A. SanFilipo; Perry A. Eaton; Gerald W. Hohmann Abstract The transient electromagnetic (TEM) response of a three-dimensional (3-D) prism in a conductive half-space is not always approximated well by three-dimensional free-space or two-dimensional (2-D) conductive host models. The 3-D...