摘要
1966年3月发生的邢台地震属震群型,五次大于6级的强震基本上都发生在邢衡隆起区中强烈下降的束鹿断陷内。水准测量结果说明,在地震前、地震时及地震后,断陷区都有明显的下降运动。大地测量结果证明,邢台地震是一个右旋型水平错动为主、并伴有水平方向的引张和垂直方向的下降运动,呈现出张扭性断层错动模型。在二次主震或强震的中间,水准复测结果说明:在已发生强震的震中一带强烈下沉,而可能的未来强震区有较明显的上升。邢台地震在地面垂直运动方面,地震前后大致存在四个地形变阶段,并在总体上具有同向地形变特征。
The Hsingtai Earthquake in March 1966 was an earthquake swarm.Five strong shocks with magnitudes of 6.0 or greater occurred in the strongly subsiding Shulu(束鹿)Graben of the Hsingtai-Hengshui(邢台-衡水)Upheaval.The results of le-velling survey show significant subsidence in the graben area before,during and after the seismic active periods.The results of the geodetic survey suggest a dislo-cation model of the tension-torsion fault type,mainly of right lateral horizontal offset,accompanied by movements of horizontal extension and vertical subsidence for the Hsingtai Earthquake.The repeated levellings during the intervals between the two main shocks and other strong shocks reveal that strong subsidence took place in the epicentral area of strong shocks while in area of probable future shocks conspi-cuous uplift was observed.The vertical crustal deformation before and after the Hsingtai Earthquake has probably 4 stages,characterized in general by deformation in the same direction.
出处
《地球物理学报》
1975年第3期153-163,共11页
Chinese Journal of Geophysics
