Abstract
The γ-ray survey was executed as a technique for detecting the fault. From the result of detection of fracture width, the fracture width broadens by the fault length . The relationship of fracture width(FW) to fault length(L) can be expressed as follows: L(km)＝0.36FW(m)＋0.62. Activity level of the active fault can be evaluated according to the fracture width of short active fault. The short active fault distributed on northeast side of Kego fault is evaluated as C class active fault from the estimation using fracture width.
