Zobrazeno 1 - 10
of 63
pro vyhledávání: '"M. H. Worthington"'
Laboratory estimates of the normal (Bn) and shear (Bt) compliance of artificial fractures in samples of Jurassic and Carboniferous limestone under wet and dry conditions are presented. The experiments were performed over a range of confining pressure
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::493ba2e80cf56b5908a78369ffd151c5
https://ora.ox.ac.uk/objects/uuid:d7e4d490-1b39-4e41-bb94-a2a18291e244
https://ora.ox.ac.uk/objects/uuid:d7e4d490-1b39-4e41-bb94-a2a18291e244
Geophysical tomographic techniques have the potential to remotely detect and characterize geological features, such as fractures and spatially varying lithologies, by their response to signals passed through these features. Anisotropic behaviour in m
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d22b51f5d926548b19eda33b1ee669e9
https://doi.org/10.1111/j.1365-246x.2004.02314.x
https://doi.org/10.1111/j.1365-246x.2004.02314.x
Autor:
Jorg V. Herwanger, Jonathan Howard Saunders, C.R.E. de Oliveira, C. C. Pain, M. H. Worthington
In this paper we describe and apply a method for constraining structure in anisotropic electrical resistivity inversion. Structural constraints are routinely used to achieve improved model inversion. Here, a second-order (curvature-based) regularizat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af7bc26a9248341e48006d6348266486
https://doi.org/10.1111/j.1365-246x.2005.02566.x
https://doi.org/10.1111/j.1365-246x.2005.02566.x
Autor:
M. H. Worthington, R. Lubbe
A field measurement of fracture compliance is described. The aim was to determine how compliance scales with fracture size and, specifically, how laboratory measurements of fracture compliance compared with field estimates from sonic and seismic data
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13df64da2a8b6328262e0134f4827326
https://doi.org/10.1111/j.1365-2478.2006.00530.x
https://doi.org/10.1111/j.1365-2478.2006.00530.x
— The structural amplitude effect, associated with focusing and defocusing due to the reflector curvature, importantly contributes to reflection seismic amplitudes. This paper develops a conciliatory approach for estimating the structural amplitude
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e159d94f38c66e164ae05fd946bab924
https://doi.org/10.1007/s00024-002-8683-1
https://doi.org/10.1007/s00024-002-8683-1
Autor:
M. H. Worthington, C. Hobday
Publikováno v:
Geophysical Prospecting. 60:488-499
Field estimates of the normal and shear compliance of water saturated fractures were obtained from a seismic experiment carried out on a wave‐cut platform of Upper Caithness Flagstone on the North coast of Scotland. The rocks are cut by two orthogo
Publikováno v:
Geophysical Prospecting. 56:5-20
We analysed vertical seismic profiling (VSP) data from two boreholes at Glyvursnes and Vestmanna on the island of Streymoy, Faroe Islands, to determine the magnitude and causes of seismic attenuation in sequences of basalt flows. The work is part of
Autor:
R. Lubbe, M. H. Worthington
Publikováno v:
Geological Society, London, Special Publications. 270:73-82
The seismic visibility of fractures depends on the magnitude of their normal and shear compliance and how these quantities vary with the scale of the fracture and depth of burial. Reliable estimates of fracture compliance as a function of confining p
Publikováno v:
Geophysical Prospecting. 52:109-121
Cross-hole anisotropic electrical and seismic tomograms of fractured metamorphic rock have been obtained at a test site where extensive hydrological data were available. A strong correlation between electrical resistivity anisotropy and seismic compr
Autor:
Christopher C. Pain, Jonathan Howard Saunders, Cassiano R. E. de Oliveira, M. H. Worthington, Jorg V. Herwanger
Publikováno v:
Inverse Problems. 19:1081-1111
We present an inversion method for 3D electrical imaging in media with an inhomogeneous and anisotropic conductivity distribution. The conductivity distribution is discretized via finite elements and is described by a second-order tensor at each fini