Abstract
Paleo-stress fields are often deduced from a set of conjugate faults. The maximum and minimum principal stress axes are obtained from the acute- and obtuse-bisector of the conjugate set with the BASIC program “FAULT”; and the intermediate axis is the intersection of the set. Faults in one bed contain some newer faults generated in the newer geologic age of the bed. So in order to know the paleo-stress field of the age of the bed, newer faults must be filterd out. The faults generated in the geologic age of the bed can be inferred from thedifference between the contour diagram of faults in one bed and that of faults in newer bed with BASIC program “STEREO”.
