晋冀蒙交界地区主要断裂的现今活动

The current activity of main faults in the joint area of Shanxi, Hebei and Inner Mongolia

用大地水准测量资料分析了晋冀蒙交界地区13条主要断裂的现今活动状态,结果发现,凡是活动断裂带通过的地段,在形变剖面图上一般都出现转折或突变。断裂现今活动与继承性活动是一致的,但是运动速率不均匀,有时快,有时慢,有时甚至作反向运动;同一条断裂有的地段活动强,有的地段活动弱。在1983～1992年间,该地区活动最强,平均速率超过2mm/a的断裂是怀安盆地北缘断裂和怀涿盆地北缘断裂;活动较强,平均速率为1.0～1.9mm/a的有恒山北麓断裂、怀安盆地南缘断裂、太白山山前断裂、蔚—广盆地南缘断裂西段、延矾盆地北缘断裂、张家口断裂、五台山北麓断裂。活动较弱,速率小于1mm/a的有蔚—广盆地南缘断裂东段、恒山南麓断裂、六棱山北麓断裂、阳原盆地北缘断裂。

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.