Abstract:
the current activity of 13 main faults in the joint area of Shanxi, Hebei and Inner Mongolia is analysed with levelling geodetic data. The results show that at all the segments that active faults passed have turnings and kicks in the profile of deformation. The current activity of faults is consistent with the inherited activity, but the velocity is not uniform, sometimes fast and sometimes low, sometimes even reverse; the motion in some segments is active but weak in other segments on the same fault. During 1983~1992, the most active faults that mean rate is over 2mm/a are the fault on north margin of Huaianzhen basin and the fault on north margin of Huaizhuo basin; the relative active faults that mean rate is 1.0-1.9 are the fault north Hengshan, south margin fault of Huaianzhen basin, the fault front Taibaishan, the west segment of south margin fault in Wei-Guang basin, the north margin fault of Yanfan basin, Zhangjiakou fault, north Wutaishan fault; the weak active faults that rate is lower than 1mm/a are the east segment of south margin fault in Wei-Guang basin, the fault south Hengshan, the fault north Liulengshan and the fault on the north margin of Yangyuan basin.