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地震 ›› 2007, Vol. 27 ›› Issue (2): 1-8.

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华北地区现今水平运动场的动态特征

杨国华, 张风霜, 韩月萍, 沈舞春, 王利   

  1. 中国地震局第一地形变监测中心, 天津 300180
  • 收稿日期:2007-01-01 修回日期:2007-02-06 出版日期:2007-04-30 发布日期:2021-10-29
  • 作者简介:杨国华(1957-), 男, 天津宁河人, 研究员, 主要从事地壳运动学与动力学、 地震中长期预测和GPS技术应用等研究。
  • 基金资助:
    地震科学联合基金项目(A07066)和科技部科技支撑项目

Danamic characteristics of nowadays horizontal movement field in North China region

YANG Guo-hua, ZHANG Feng-shuang, HAN Yue-ping, SHEN Wu-chun, WANG Li   

  1. First Crust Monitoring and Application Center, CEA, Tianjin 300180, China
  • Received:2007-01-01 Revised:2007-02-06 Online:2007-04-30 Published:2021-10-29

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摘要： 在整体无旋转基准的基础上, 采用了以提取中、 低频应变信息为主的连续应变模型, 处理并分析了《中国地壳运动观测网络》在华北地区400余个GPS测站的复测资料(1999—2001—2004年)和2006年130余个测站的复测资料, 获得了1999—2004年、 2004—2006年的相对运动速率以及2004—2006年偏离1999—2004年运动的位移结果。 结果表明: ① 华北地区非均匀应变比较明显, 不同时段的结果在空间上的表现形式也不一样; ② 前后两个时段的运动特征具有一定的不一致性; ③ 2006年存在着较明显的偏离位移, 并显示了右旋形变的迹象, 面应变表现为北、 中收缩, 南部膨胀的特征; ④ 近两年东西向的压性作用较前明显, 北京以南地区是运动的转化地区及面应变象限的准中心地区。 这可能表明, 在昆仑山口西8.1级地震之后, 华北地区又进入了常态能量的积累阶段。

关键词: GPS, 水平运动与应变, 动态特征, 华北地区

Abstract: On the basis of region with no-net rotation, and by using continuous strain model focused on extracting medium-low frequency strain information, the paper deals with and analyzes the re-measured GPS data (1999—2001—2004) obtained from more than 400 GPS monitoring stations and also the GPS data re-measured in 2006 from more than 130 GPS monitoring stations in North China in the Project of “China Crust Movement Observation Network”. We gain the relative motion velocity of 1999—2004 and 2004—2006, and acquire the displacement results of the deviation motion of 2004—2006 with respect to 1999—2004, the results suggest: ① The uneven strains in North China region are obvious, results of different periods distinct from each other in the spatial representation style; ② The movement characteristics of former and latter two periods are inconsistent to a certain extern; ③ There exists obvious deviation displacement in 2006, and shows a evidence of right revolving deformation, its the surface strain shows the characteristic of surface contraction in central and north part of the region; and superficial expansion in south part of the region; ④ The compression in the EW direction during recent two years is more obvious than before, to south of Beijing it is the area of movement conversion and the quadrant pseudo-center of surface strain. These may suggest that North China region enter the energy-accumulated period after Kunlun Mountain MS8.1 earthquake.

Key words: GPS, Horizontal movement and strain, Dynamic characteristics, North China

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