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True dip is the angle between an inclined surface and the horizontal, measured perpendicular to a horizontal line in the plane ([[strike]]). The dip seen in a limited data set (well bore, outcrop, cross section, seismic line, etc.) may not be perpendicular but rather cut at an angle, and is the apparent dip; this is less that the true dip.it is usually written as 4S (dipping 4 degrees  in the southerly option perpendicular to strike; this requires that a strike be given), 4 SE (likewise), or 4 65SE (dipping 4 degrees in a 65SE direction; this by inference gives the strike, because it is perpendicular).
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[[File:Dip.svg.png|thumbnail|300px|{{figure number|1}}Strike and dip of the beds: 1-Strike, 2-Dip, 3-Apparent dip, 4-Angle of dip. Source: Wikipedia. Author: Eurico Zimbres.]]
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True dip is the angle between an inclined surface and the horizontal, measured perpendicular to a horizontal line in the plane ([[strike]]). The dip seen in a limited data set (well bore, [http://www.merriam-webster.com/dictionary/outcrop outcrop], [[cross section]], seismic line, etc.) may not be perpendicular but rather cut at an angle, and is the apparent dip; this is less than the true dip. It is usually written as 4S (dipping 4 degrees  in the southerly option perpendicular to strike; this requires that a strike be given), 4 SE (likewise), or 4 65SE (dipping 4 degrees in a 65SE direction; this by inference gives the strike, because it is perpendicular).
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[[:File:Dip.svg.png|Figure 1]] illustrates the strike and dip of beds.
    
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[[Category:Geological methods]]
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[[Category:Geophysical methods]]
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