首都圈地区地壳垂直形变特征及剖面分析

利用首都圈地区4期精密水准复测资料，分别计算2001～2005年、2005～2007年、2007～2014年地壳垂直形变速率，绘制垂直形变速率图并选取部分水准路线绘制剖面图，结合主要断裂分布及活动性，分析首都圈地区形变趋势。结果显示，前两个时间段内首都圈地区形变特征以趋势性运动为主，呈现东西升、南北降的特征；最新一期数据表明，东西部形变出现趋势性转折，尤其是张家口渤海构造带出现大幅下沉，预示了该区域应力场变化呈现加强态势。

Characteristics of Vertical Deformation and Profile Analysis for the Capital Circle

In order to analyze deformation trends, we use the four-period reiteration precision level data of the capital circle to calculate the ground vertical deformation rate for 2001-2005, 2005-2007 and 2007-2014, draw the vertical deformation rate map and the profile map, combining these with the main fracture distribution and activity. The results show that the deformation characteristics mainly give priority to trend movement in the first two periods, presenting ‘east and west to up, north and south to down’, while the latest data show that deformation appears trend turning in both east and west, with an especially sharp sinking in the Zhangjiakou-Bohai tectonic belt. We predict a tendency of strengthening stress field for this area.