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地震 ›› 2003, Vol. 23 ›› Issue (4): 32-36.

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用GPS 资料分析渭河盆地及邻近地区地壳运动特征

戴王强1, 王庆良2, 冯希杰1, 赵小茂1, 任隽1, 王凤1   

  1. 1.陕西省地震局, 陕西西安 710068;
    2.中国地震局第二形变监测中心, 陕西西安 710000
  • 收稿日期:2002-12-07 修回日期:2003-03-18 出版日期:2003-10-31 发布日期:2021-12-21
  • 作者简介:戴王强( 1978-), 男, 河北定州人, 2000 年在读硕士生, 主要从事大地测量、活断层等研究。

Analysis of crustal movement feature based on GPS data in Weihe basin and its neighboring region

DAI Wang-qiang1,3, WANG Qing-liang2, FENG Xi-jie1, ZHAO Xiao-mao1   

  1. 1. Seismological Bureau of Shaanxi Province, Xi' an 710068, China;
    2. The Second Crustal Deform ation Monitoring Center, CSB, Xi' an 710000, China;
    3. Lanzhou Institute of Seismology, CSB, Lanzhou 730000, C hina
  • Received:2002-12-07 Revised:2003-03-18 Online:2003-10-31 Published:2021-12-21

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摘要： 利用中国地壳运动观测网络工程1999 ~ 2002 年渭河盆地及邻近地区GPS 观测资料, 以及陕西省地震局2001 ~ 2002 年的GPS 观测资料, 研究了渭河盆地及邻近地区地壳运动速度场。结果表明, 渭河盆地及邻区的运动速率有明显的WE 向条带状变化特征, 鄂尔多斯块体南缘呈整体不连续性逆时针旋转运动, 相对鄂尔多斯块体内部的榆林测点, 平均速率约为5.7mm/ a;渭河盆地中部的彬县— 西安— 蓝田一线两侧存在一个左旋剪切带( 东侧) 和右旋剪切带, 左旋剪切带的北部区域与铜川— 泾阳— 临潼— 渭南小震频发区恰好对应;鄂尔多斯块体东南缘临汾盆地东侧, GPS 观测点资料表现出应力集中的迹象, 该区与临汾-韩城地震带也有较好的对应关系。

关键词: 鄂尔多斯块体南缘, 渭河盆地, 地壳运动, GPS, 地震活动

Abstract: According to the observed data in Weihe basin and its neighboring reg ion provided by CMONOC during 1999 ~ 2002 as well as GPS' s data observed by seismological bureau of Shaanxi Province during 2001 and 2002, the authors studies the crustal movement veloci ty field of Weihe basin and it s neig hboring region.The characteristics are listed as follow s:the movement in Weihe basin and its neig hboring region shows obvious bandlike NE directio n change. South bo rder of Erdos block show s incontinuous counter-clockw ise rotation.Related to Yulin observat ion site, the movement average rate is about 5.7 mm/1.At tw o sides of the Binxian-Xi′an-Lant ian ray in middle part of Weihe basin exist a lef t-lateral shear belt ( eastern side) and a right-lateral shear belt, and the left-lateral shear belt is just located near the earthquake zone of Tong chuan-Jingy ang-Lintong-Weinan.The southeaster margin of Erdos block is to the east of Linfeng basin, it is st ress -concentrated region show ed by GPS crustal movement data, and it has well corresponding relation to the Linfen-Hancheng earthquake region.

Key words: Southern margin of Erdos block, Weihe basin, Crustal movement, GPS, Seismicity

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