华北地区断裂带的现代形变特征

断层形变观测揭示华北地区西部的速率大于东部。华北地区(特别是西部)的断层活动主要具有正断性质，但华北东部的逆断活动比例高于西部。断层应变累积率在包头6．4级和张北6．2级地震前明显增大，可能与地震孕育有关。呼和浩特-大同地带、渤海湾地区、莱州湾-沂水地段和太原盆地是现今压应变速率相对较大的地区，有一定的应力积累。水平应变反映出郯庐断裂带、河套-张家口-蓬莱隐伏断裂带等有明显的分段性，各段的活动及应变特征存在差异。

CHARACTERISTICS OF CURRENT DEFORMATION OF FAULT BELTS IN NORTH CHINA

The results of cross fault deformation surveying indicate that the rates of the crustal deformation in the west of North China are larger than that in the east.As regards the fault movement,in the west,the faults are predominantly normal and in the east the thrust faults are the most.The rates of fault strain accumulating grows on obviously before the Baotou 6.4 and Zhangbei 6.2 earthquakes. This is probably related with the development of those earthquakes. The rates of present day main pressure strain of Huhhot Datong, Bohaiwan, Laizhouwan Yishui zones and Taiyuan basin are comparatively large,which indicates that there is a certain stress accumulation in these areas. The horizontal strain features reflects that the fault movements and strain features of Tancheng Lujiang fault belt and Hetao Zhangjiakou Penglai subsurface fault belt are different.