关键词: 地形变, 走滑断层, 地震活动闭锁区, 棘轮装置

Abstract: In this paper two vertical deform anon maps have been drawn, based on the accurate leveling data of 1950-1980, in Jiangsu-Shandong-Anhui area. Along combining with neotectonic, geological basis and crustal deformation data, an analysis of the recent tectonic activity in the studied area has been made,and some conclusions have been drawn as follows: (1) The Tancheng-Lujiang fault zone across the studied area is the keY tectonic ele m ent in recent tectonic activity, and the crustal deform ation is controlled by the fault zone. (2) A study of the two deformation maps shows that the section of the Tancheng-Lujiang fault zone in this area is a creeping section, but both ends of the section are locked parts. The stress concentration ought to be accumulated in these parts. (3) Difference between the two maps suggests that the activity character of the fault zone is right lateral slip during 1950 to 1970, but reverse activity has occurred since 1982 to 1983. This suggests that the most intense earthquake in East China (magnitude was estim ated to be 8.5 and occurred in 1668, south Shandong) could be generated with the tectonic activity of the Tancheng-Lujiang fault zone.

Key words: Ground deformation, Striking-slip fault, Locked region of seismic activity, Ratchat wheel gear