Geometrical Characteristics and Tectonic Activities of Northern Margin Fault of the Huai'an Basin

Combining with previous investigation and research data, this paper analyzes the tectonic feature of the northern margin fault of the Huai 'an basin using the methods of topography analysis, geological survey, remote sensing, etc, systematically studies the geometric structure, tectonic deformation and fault activity characteristics of the active fault zone. Huai'an basin fault controls the development of the Quaternary tectonic evolution and landform near the Huai'an basin. According to the fault distribution and fault activity, it can be divided into three sections:the eastern segment (Ximalin-Dongyanghe river), middle segment (Dongyanghe river-Mashikou) and west segment (Mashikou-Hanjiaying). The fault is a atypical mountain-basin boundary, along which we can found significant activity characteristics in many places. There are fault activity traces on the fracture surface:mirror structure, scratches. Each stage has their own activity features, the east segment has the strongest activity, the middle segment take second place, the west segment has the weakest activity.