关键词: 断裂带, 新生代, 营口-潍坊

Abstract: The Yingkou-Weifang fault zone, which is practically one part of Tanlu fault zone in Liaohe-Bohai, lies in the east edge of Bohai Gulf Cenozoic rift basin. It can be divided into two parts, the northern and southern part, by the Beijing-Penglai fault zone. The northern part consists of two faults which interweave like a braid each other. The southern part consists of two parallel faults, and is cut into four parts by Huangbei, Laibei, and Weibei NEE trending fault. The horizontal stretch and vertical movement of the northern part of the fault zone are strong in the Paleogene period, controlls the rifting basin development; nevertheless the right-lateral slip has been prominent since the late Oligocene. The activity of the southern part is weak in the Cenozoic Era, but the cross faults have evident horizontal stretch and vertical action. In the Cenozoic Era, the activity of the fault zone migrated to the middle part from the northern and southern part, and the activity of northern part probably also had the trend from west to east. A NE trending seismic zone, which obliquely cross the Yingkou-Weifang fault zone in the middle of Bohai, is probably the extending part of the Huangheko Liaocheng newly generated seismotectonic zone towards the sea.

Key words: Fracture zone, Cenozoic era, Yingkou-Weifang