关键词: 京津唐地区, 活动断裂, 大地测量

Abstract: In this paper, we have studied the recent activity of main faults in these regions using geodetic data obtained from short leveling, regional leveling and short baseline measutements across faults, vertical movement values for about twenty faults have been calcalated and horizontal movement values for some faults have been also obtained from repeated leveling and baseline measurements. According to the level of fault activity, the faults may be divided into two classes, the annual vertical movement rate is 1 to 10mm for the first class, 1-0.1mm year for the second one.The recent active characteristics of these faults are discussed in combination with geological and geophysical data. There appear to be two aspects, some intensively active faults in Quaternary period have remained to be intensively active in recent years; the rate of fault activity is of no linear relation to time in these regions, suggesting an ac-celarated motion along 9 faults in an area with radius of 200km from the epicenter before Tangshan earthquake.

Key words: Beijing-Tianjin-Tangshan region, Active fault, Geodetic measurement