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- Volume 6, Issue 10, 1988
First Break - Volume 6, Issue 10, 1988
Volume 6, Issue 10, 1988
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Continuous vertical electrical sounding
Authors R.A. van Overmeeren and I.L. RitsemaVertical e1ectrical sounding (VES), the most important geophysical technique for groundwater exploration to date, has in practice been limited to point observations. High-resolution seismic reflection is currently being developed rapidly, offering the hydrogeologist continuous sections with very precise and detailed information. However, seismic sections do not reveal anything about water quality. A microcomputer-controlled geo-electrical instrument, the GEA-58, has been developed. It allows resistivity measurements to be made automatically for any electrode configuration, using expandable multielectrode cables. The procedures are designed to enable continuous soundings along a profile in the most efficient way yet. This paper describes the control software and the various measurement procedures. Two case histories are presented, showing the efficiency and power of continuous electrical sounding for groundwater exploration and monitoring groundwater quality.
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A practical set of guidelines for geophone element testing and evaluation
Authors A.L. Hagedoorn, E.J. Kruithof and P.W. MaxwellIn seismic exploration it is usual for considerable effort to be spent in defining and checking the specifications of the recording instruments. Similar evaluations of seismic detectors are rarely performed. The lack of quality control applied to geophones is partly due to the apparent complexity of the tests, and confusion over the results generated. This paper aims to shed light on this area and to propose simple procedures for geophone testing and evaluation. The questions one should ask before acquiring geophones are: • Do the geophones meet the geophysicists' requirements? • Do the geophones really conform to their specifications? • Can we predict durability? • What is the actual durability? The answer to this last question will only be known after some field use. Let us look at the other questions in sequence.
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)