A new trigonometrical method for calculating total slip (T) of faulting is presented. The parameters for the calculations are used rake of fault striation, strike and dip of fault and of index planar structure such as bedding plane. The fualts are groupped into three types. The direction of plunging of fault striation is out of a range±90˚to the bedding dip direction in 360˚system, which is groupped into the type I. Meanwhilt, the case of the direction lies in the above range can be seperated into two different types, type II adn type III, accordinf to relative largeness of the andgles rake of falult striation and i(see text). The type II has smaller rake than angle i and the type III has larger rake than angle i. Here I propose a few equations for calculating not only total slip (T) but strike slip (L) or dip slip (S) of the faulting. The equations are adapted selectively to the types of fault mentioned before. The limitation of the method is that the equations do not fit to polyphase faulting.
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