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Uren Block

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Journal Article
Journal: Geophysics
Published: 01 January 2000
Geophysics (2000) 65 (4): 1168–1178.
...Patrick N. Okoye; Norm F. Uren Abstract In an elastically anisotropic medium where the seismic wave velocity is a function of direction, the wave-front shape is nonspherical and, in most cases, assumes a nonelliptical shape. Numerical modelling techniques have been used to calculate the Fresnel...
FIGURES | View All (14)
Published: 01 January 1996
DOI: 10.1190/1.9781560802693.ch4
EISBN: 9781560802693
... Abstract Physical modelling experiments have been conducted to study how the degree of anisotropic influence on spatial resolution varies with the orientation of the symmetry axis in transversely isotropic materials. Blocks of Phenolite laminated plastic comprising sheets of paper set...
Journal Article
Journal: Geophysics
Published: 10 April 2009
Geophysics (2009) 74 (3): F31–F43.
.... The Fréchet derivative expressions were derived for the 2.5D and 3D problems using constant-point and constant-block model parameterizations. Special cases such as an isotropic earth and tilted transversely isotropic (TTI) media emerge from the general solutions. Numerical examples were investigated...
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Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2016
DOI: 10.1144/SP434.4
EISBN: 9781862391581
... Abstract A siliceous permineralized peat block recovered from Hopen in the Svalbard archipelago hosts a low-diversity Late Triassic flora dominated by autochthonous roots and stems of bennettitaleans and lycophytes, and parautochthonous leaves, sporangia, spores and pollen from a small range...
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Journal Article
Journal: Geophysics
Published: 26 March 2019
Geophysics (2019) 84 (3): C129–C142.
... of stretch-free NMO was proposed by Rupert and Chun (1975) . This method moves blocks of data as units and consequently eliminates stretching of any reflections within a block. Similar or improved methods are implemented by Shatilo and Aminzadeh (2000) , Brouwer (2002) , and Trickett (2003) . To achieve...
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Journal Article
Journal: AAPG Bulletin
Published: 01 July 1991
AAPG Bulletin (1991) 75 (7): 1161–1177.
... exaggerated, unmigrated seismic profile is evident in Figure 2A from Harding and Lowell (1979) . Their original figure caption states that the “inclination of fault is approximated by syncline’s axial plane which dips steeply under upthrown block.” The profile is reinterpreted in Figure 2B to show...
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Journal Article
Journal: Geophysics
Published: 01 January 2001
Geophysics (2001) 66 (4): 1217–1225.
... method where P -wave phase velocities are determined on both an isotropic and anisotropic material. Mah and Schmitt's (2000) methodology expands to include the determination of S -wave velocities on an isotropic glass block. We describe further development of an experimental method for measuring...
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Journal Article
Journal: Palynology
Published: 01 June 2014
Palynology (2014) 38 (1): 129–137.
...% of the results produced conventionally by a palynologist. An innovative methodology to discriminate three species of pollen from the Family Urticaceae (Parietaria judaica, Urtica membranacea and Urtica urens) using computer techniques for the definition of digital shape parameters to represent a pollen...
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Journal Article
Published: 01 November 2007
Quarterly Journal of Engineering Geology and Hydrogeology (2007) 40 (4): 315–332.
... is typically 10–20 mm + 1 ppm horizontally and 20–30 mm + 1 ppm vertically ( Uren & Price 2006 ), but depends on the observing conditions. An important control on precision is the number of satellites available and the geometry of their positions. It was therefore important to be aware of the changing...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 2001
AAPG Bulletin (2001) 85 (2): 221–232.
.... Shaw and N. White resulted in substantial improvements to the original manuscript. In addition, this article benefited from constructive comments by AAPG editor Neil Hurley and Mike Middleton. We also acknowledge Norm Uren and Murry Hill for their support of the Landmark Systems facilities for seismic...
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Journal Article
Journal: Geophysics
Published: 13 December 2013
Geophysics (2014) 79 (1): R27–R39.
... to simulate a fractured medium (e.g., Uren et al., 1990 ; Brown et al., 1991 ; Cheadle et al., 1991 ; Tadepalli, 1995 ; Chang and Gardner, 1997 ; Mah and Schmitt, 2001a ; Wang and Li, 2003 ). A manufactured board of phenolic material is milled to provide flat and perpendicular surfaces parallel...
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Series: Special Publications of the Society of Economic Geologists, Special Publications of the Society of Economic Geologists
Published: 01 January 2006
DOI: 10.5382/SP.13.01
EISBN: 9781629490373
... exploration focused on the Giles Complex (Musgrave Block) and Fraser Complex (Albany-Fraser mobile belt). The Yilgarn has a well-developed regolith that was poorly understood in the 1960s. Sulfide deposits tended to be particularly obscured by weathering because commonly only a ferruginous residue...
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Journal Article
Journal: Geophysics
Published: 16 March 2018
Geophysics (2018) 83 (3): S261–S270.
... M. D. , 2015 , Block row recursive least-squares migration : Geophysics , 80 , no.  5 , A95 – A101 , doi: http://dx.doi.org/10.1190/geo2015-0070.1 . GPYSA7 0016-8033 Kuehl H. Sacchi M. D. , 2003 , Least-squares wave-equation migration for AVO/AVA inversion : Geophysics...
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Journal Article
Journal: PALAIOS
Published: 24 September 2020
PALAIOS (2020) 35 (8): 342–357.
.... Further south and west in the Sydney Basin, the correlative part of the succession is dominated by the finer grained Dooralong Shale. The two formations represent apparently coeval facies on a broad scale but, locally, wedges of the Munmorah Conglomerate rest above the Dooralong Shale (Uren in Herbert...
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Journal Article
Journal: Geophysics
Published: 24 May 2019
Geophysics (2019) 84 (4): S285–S299.
..., 2000 ; Simoncini and Szyld, 2002 ), or they can be fixed ( Bridson and Greif, 2006 ). The preconditioned CG algorithm can be used with a single preconditioner such as the ones encountered in the block CG algorithm ( O’Leary, 1980 ) or with multiple preconditioners ( Bridson and Greif, 2006...
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Journal Article
Published: 01 February 2009
Mineralogical Magazine (2009) 73 (1): 27–42.
... of locations including (where preserved) around the calciner building, the lambreth and the chimney stack, whilst one sample was taken from a heavily weathered domestic property wall that was almost entirely constructed from blocks of arsenopyrite-rich mine waste (arsenopyrite >50%). In all but two...
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Series: Society of Exploration Geophysicists Geophysical References Series, Society of Exploration Geophysicists Geophysical References Series
Published: 01 January 2011
DOI: 10.1190/1.9781560802839.ch2
EISBN: 9781560802839
... traveltimes. The model represents a simplified version of a typical section from the Alberta Foothills, with the horizontal target reflector beneath a bending TTI thrust sheet. The parameter ε was obtained using the traveltimes of a wave that crosses one of the dipping TTI blocks and reflects from...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 1973
AAPG Bulletin (1973) 57 (11): 2169–2194.
... ( Fig. 3 ). This erroneous conclusion appears to be the greatest factor blocking an understanding of birth-limiting motivations. The factors causing the United States birthrate decline apparently resumed in 1958, when another rapid decline began and is continuing. Factors influencing population growth...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 1942
AAPG Bulletin (1942) 26 (1): 100–122.
.... There are four general geologic types of fields: anticlinal, domal (piercement and non-piercement), fault, and stratigraphic trap. In each type the productive section may form a single continuous reservoir, or it may be divided into more or less discrete blocks or segments which may or may not have common...
Journal Article
Published: 01 October 2005
Mineralogical Magazine (2005) 69 (5): 577–589.
..., but poor results when applied to sediment samples. 0.1 g of sample was accurately weighed into acid-washed digestion vessels containing 9 ml of HCl and 3 ml of HNO 3 , and the resultant solution was heated at 140°C for 1 h in a digestion block. The solutions were allowed to cool and then diluted to 100...
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