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Determination of strike and dip
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5-degree 60-degree curve A-cos acute angle alternative solutions angle of intersection Apparent length appropriate curves arctan base grid basic data check for intersection combinations of strike DEGREE INCREMENTS Descriptive geometry descriptive-geometry problem determination of strike dip in quadrant dip relative direction of dip drill hole penetrates drill-hole core elevation 800 feet footwall geologic structure Geology GRAPH 2 LYONS hanging wall hole axis Hole Inclined hole is drilled holes are inclined HRPi inclination h intersection of appropriate left dip Left Hole length of line line corresponding List of Symbols lithology McClellan normal to hole one-hole problem penetrates the fault planar structure plane normal point of penetration relative to Hole right dip Right Hole right or left side of graph sin2 ah solution for strike spacing between parallel stereographic projection strike and dip structural feature Structure in Drill-Hole structure relative thickness of structures top graph true north two-hole problem unique solution