京津唐地区的现今垂直形变特征及其构造活动的含义

CHARACTERISTICS OF PRESENT VERTICAL DEFORMATION AND TECTONIC ACTIVITIES IN BEIJING-TIANJIN-TANGSHAN AREA

基于京津唐地区近十几年来的水准观测资料计算得到地壳垂直形变速率和主要断裂带的活动速率,研究了京津唐地区地壳块体垂直运动特征和主要断裂带的活动性。垂直形变表明京津唐地区地壳近十年来北部上升、南部下降,这种垂直变化与地形地貌的北高南低基本相符,反映出构造活动属于继承性运动,多数块体呈现掀斜活动;主要断裂带活动性质存在差别,有的表现为正断,有的为逆断,有的呈枢纽运动;断裂带的垂直活动速率为1.00～2.00 mm/a。

On the basis of vertical deformation rate and the activities rate of main fault zone which calculated from leveling data during 2000-2008,the vertical movement character of crustal blocks and the activity of main fault zone in Beijing-Tianjin-Tangshan area were studied.There was a rising vertical deformation in the north and a declining one in the south of Beijing-Tianjin-Tangshan area in past ten years.These vertical deformation roughly matched the topography and the landform,it reflected that the tectonic activities was a kind of inheritable movement.Most of the blocks had tilting activities.The activities of main fault were different,some of them were normal faulting activities,some of them were reverse faulting activities,some of them were turn twitching activities at vertical plane.The vertical activity rate of fault zone in Beijing-Tianjin-Tangshan area were between 1.00-2.00 mm/a.