THE CHARACTERISTICS OF RECENT TFCTONIC ACTIVITY AND DEFORMATION FIELD IN BEJING AREA AND THE JUNCTURE OF HEBEI AND SHANXI PROVINCES

Based On the synthesis of recent vertical deformation, horizontal deformation in Part of the region and survey data Over fault is shown that for the stress field of Bejing and the juctare region of Hebei and Shanxi provinces the principal tension stress is NW-NNW and principal compression stress is NE-NEE and that this region has a uplift actiOQ of deep structure. Under the unified action of several kinds of forces Mt Yatuhan region continuei to aplift, fault basins and Beijing plain relatively subside. In the region, most of NE faults arc tensile-torsional and NW fault are torsional. The short base line data show the recent horizontal deformation is larger than vertical and tension stress is larger than campresisve strain.