Abstract
We present a new method to evaluate a net slip along a fault on the basis of numericalexpression for various types of data related to the fault movement (offsets of a point, a lineand a plane, striation and others) .A fault plane is expressed by three unit vectors : Sf which is parallel to the strike of the fault plane, df which is paralell to the dip of the plane and ef which is oriented in the direction normal to the plane. Then, a net slip v is expressed by v=Ssf+Ddf, where S and D are strike slip and dip slip components of a net slip v, respectively, and various types of data are soformulated as the relation between S and D including inequalities.These relations are displayed as points, lines or limited areas on a 2-dimensional graph with S-axis (abcissa) and D-axis (ordinate) or S-D diargam. A net slip is evaluated on the bases of both expressions of relation between S and D, and plots on S-D diagram.
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