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9th SAGA Biennial Technical Meeting and Exhibition
- Conference date: 14 Sep 2005 - 16 Sep 2005
- Location: Cape Town, South Africa
- Published: 14 September 2005
61 - 66 of 66 results
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Interpretation of a 3D Ultra-High Resolution Chirp Seismic Dataset Acquired by an Autonomous Underwater Vehicle (AUV)
Authors I. Stevenson, L. Martin and G. NgaisiueDe Beers Marine (DBM) have been routinely operating an Autonomous Underwater Vehicle (AUV) as its principle
ultra-high resolution geophysical survey platform since 2001. This platform routinely collects Swathe Bathymetry,
Side Scan Sonar and Chirp Sub-Bottom profiler data in support of DBM’s mining activities for diamondiferous
gravels, offshore the west coast of Southern Africa.
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Deep-Crustal Electrical Imaging Beneath the Vredefort Impact Structure, South Africa, Using Broadband Magnetotellurics
Authors M.R. Muller, S.J. Webb, A.G. Jones, W.H.B. Steenkamp, P. Kowalczyk, R.L. Evans, C.J.S. Fourie, C. Smith, A. Mountford and the SAMTEX teamMagnetotelluric (MT) data have been recorded along a 200 km-long profile across the auriferous Archaean
Witwatersrand Basin, South Africa, (Fig. 1) as part of the broader, multi-institutional Southern African MT
Experiment (SAMTEX).
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The Calibration of CSAMT Data in a Strong Magnetic Background
Authors O. Terblanche and J.J. van der WaltCSAMT has become an important tool for De Beers in areas with sedimentary cover for the delineation of
kimberlites and surrounding country-rock geology. This method provides high-resolution conductivity sections
from which geologic horizons can be interpreted and combined with other datasets to generate 3-D geologic
models. However, confirmation drilling in some environments has demonstrated a constant depth exaggeration. An
average exaggeration of 30% was observed.
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Fractal analysis of African River basins, Paleo-Drainage Reconstruction and Related Ecological Economics
Authors J. Stankiewicz and M. de WitRiver systems are often referred to as a type-example of fractal geometry in Nature.
We test this for major river basins across Africa and investigate deviations from
perfect fractals to test for geologic and climatic variables, and determine thresholds
relevant to future surface water supplies.
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Hydrogeological Effects on Superconducting Gravimeter Measurements at Metsahovi in Finland
Authors T. Hokkanen, K. Korhonen, H. Virtanen and M. PirttivaaraThe purpose of this study is to gain a better knowledge of superconducting gravimeter (SG) data at the
Metsähovi Gravity Station in Southern Finland. SG data have a high accuracy (1 ngal) and are very sensitive
to various environmental and hydrogeological effects. So, before we are able to investigate their effects on
data we must isolate them and analyze their characteristics.
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Processing of Multicomponent Seismic Data Acquired on Transects in Barents-Kara Region
More LessThe main purpose of this project is to find a way of estimating porosity using 3D-seismic data. Here the development of
a method for processing and interpretation of multicomponent seismic data is presented.
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