关键词: 断层活动性, 地壳形变测量, 重力测量

Abstract: The deformation and gravity remeasurement data which are used to monitor the activity of the Nankou mountain frontal fault in Beijing is analysed systematically.It is suggested that each segment of the fault shows differential activities.The segment from Shangkou to Nankou has small amplitude of activity.The Nankou-Baiyangcheng segment has persistent activity at a larger rate.The Baiyangcheng-Mabaoquan segment is characterized by discontinuous wrench or tensional movement.The style of the fault may have been changed prior to and following major earthquakes.The development process of major earthqukae may be representative of the regional tectonic activity.The deep activities of each segment of the Nankou mountain frontal fault are in unity and there exists local strong tectonic motion.Much attention should be paid to this fault,in particular to the Nankou-Baiyangcheng segment.where major earthquakes may occur.

Key words: Fault activity, Crustal deformation survey, Gravity survey