Glossary

Dip, true dip

The true dip is steepest line that can be drawn on an inclined plane. Measured in terms of inclination (from the horizontal) and its bearing (from north), and when used in conjunction with unit length it can be considered a vector quantity. The azimuth of the dip is at right angles to the strike of a bed. In borehole image and dipmeter processing, dips are referenced to true north following correction for tool and hole orientation; this is the usual way of presenting dips.

WHITTEN, D.G. and BROOKS, J. R. V. 1972. A Dictionary of Geology, Penguin Books, Hardmondsworth, p495.

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About the glossary
This listing is not exhaustive or definitive, do not expect Oxford English Dictionary standards; it is aimed at those who need to understand basic principles and those that read reports on dipmeters and borehole images requiring some technical help to get the most from such documents.

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Acknowledgements
This listing has been derived by Task Geoscientists. All external sources are fully acknowledged.