![]() ![]() Exactly south is a strike of 180° exactly NW a strike of 215° and so on. Thus if the horizontal line trends exactly north-east its strike is 045°. The strike of the surface to be measured is defined as the orientation of a horizontal line on the surface using the 0°-360° divisions of the compass. You probably know all this – it is pretty much geology 101 as the Americans say – but bear with me, I intend to start with some basic definitions and work my way up to ideas that may not be so familiar to you. Strike and dip is a convention for measuring the attitude of a planar structure, such as a bedding plane, fault, joint or vein, in terms of the angles which it makes with the geographic coordinates of the earth’s surface – north-south, east-west and up-down. ![]()
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