PRELIMINARY STUDY OF THE CHARACTERISTICS OF THE ACTIVITY OF HANCHENG FAULT AND EARTHQUAKE VESTIGES NEAR THE FAULT

Hancheng fault is the northwestern bound of Hejin depression. Through geological and geomorphological investigation, we found that Hancheng fault is a strikingly active fault with strong geomorphological expressions showing a feature of both vertical and right-lateral displacement. It has a moving rate ranging from 0.12-0.79mm/yr since Pliocene with a minimum overall vertical displacement of 1500-1800m. There are a lot of earthquake vestiges along the fault reflecting that there at least occurred one large earthquake with magnitude greater than 6-7 since the end of late Pleistocene.