摘要:
综合近期垂直形变、部分地区水平形变以及跨断裂的测量资料,说明北京及其晋冀交界地区区域应力场以北西-北北西为主张应力和北东-北东东为主压应力方向,并有深部构造的上拱作用,在几种力的联合作用下,燕山折断带山区继续抬升,断陷盆地和北京平原相对下降,区内大部分北东向断裂表现为张扭性,北西向具有反扭特征。短基线资料表明近期水平形变大于垂直形变,张应变大于压应变。#br#上述地区大致位于北纬39°40'-40°50'、东经176°50'-113°10',包括北京及其西北部分的一系列盆地,直至晋冀交界地区。这个地区从1969年以来,被有些单位列为可能发生强震的危险区,其中地壳形变手段即是划分该危险区的依据之一。
Abstract:
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.
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