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NERC Open Research Archive
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  • New geochemical and geophysical data of Northern Ireland

    The Geological Survey of Northern Ireland has completed new geochemical and airborne geophysical surveys over the whole country that will promote further mineral exploration. The geochemical surveys map the distribution of 60 elements in three sample media and geophysical imagery provides great detail on potentially mineralised structures. New anomalies in gold, platinum group elements and base metals have been mapped. Regionally, the airborne geophysical imagery refines and extends existin...

    Estimating anisotropic parameters from PS converted-wave data : a case study

    Anisotropic parameters are estimated from PS converted-wave (C-wave) data. The data were acquired by digital MEMS (micro-electro-mechanical system) sensors over a volcanic gas reservoir in Northeast China with a mixed sand and shale sequence in the overburden. This gives rise to both shear-wave splitting and anisotropy moveout effects due to presence of vertical transverse isotropy (VTI). We use a four-parameter theory to evaluate the effects of non-hyperbolic moveout due to an asymmetric ray...

    Geoelectric structural dimensions from magnetotelluric data : Methods of estimation, old and new

    A magnetotelluric (MT) sounding curve obtained at a given location may contain contributions from 1-D, 2-D, or 3-D geoelectric components, either singly or in combination. The modeling and interpretation of such data depend upon the ability to assess the degree of influence exerted by the three possible structural components. Six existing MT sounding curves provide case histories of the performance of both conventional and new methods for estimation of structural dimensions. For data from a s...

    Chemical exposure and stress responses in UK fish

    1. This scoping study was conducted to assess whether evidence exists for effects of wastewater treatment works (WWTW) effluent on the adaptive stress axis of fish. 2. A total of 427 three-spined sticklebacks were sampled during March and April 2011 from sites downstream of ten WWTWs serving rural and urban areas with population equivalents of between 1,000 and 120,000. Sticklebacks were also sampled from three sites with known heavy metal contamination and from a laboratory population ma...

    Separation of oceanic and continental crustal field signatures using Slepian functions

    Models of the crustal magnetic field are typically represented using spherical harmonic coefficients. Rather than spherical harmonics, spherical Slepian functions can be employed to produce a locally and also globally orthogonal basis in which to optimally represent the available data in a region at a given degree. The region can have any arbitrary shape and size. The Slepian functions can be tailored to be either band- or space-limited, allowing a trade-off between spectral and spatial conce...
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