DISCUSSION ON BASIC FEATURES OF THE DEFORMATION ZONE AND GENESIS OF1932 CHANGMA EARTHQUAKE (Ms=7.5)

According to the latest observation results in Chaugma earthquake district,this paper has in detail discussed basic features of the deformation Zone of Changma earthquake and the recent active characteristics of Changma fault.#br#The Changma fault that has a long active history and dissects deeper crust is an ultralithosph一eric one still active at present.The series of ridges and valleys were clearly dislocated in left-lateral way and their horizontal displacements which are divided into four sections indicate that four ftetivitities took place at least along the fauIt.The fourth section of the displacements is 4,68 meters which is probably the result of 1932 Changma earthquake.#br#The deformation Zone of Changma earthquake is relatively clear and basically extends along Changma fautt.The deformation zone consists of ground crack, drumlin and steep cliffs and was accompanied with landslide and slump,The anticlockwise movement showen by mechanical analysis Of the deformation Zone indicates left-lateral and tensile active characteristics of Changma fault Finaly, we studied the original model of Cchangma earthquake.