GPS初步揭示的渭河盆地及边邻地区地壳水平运动特征

英文篇名：CHARACTERISTICS OF HORIZONTAL CRUSTAL MOVEMENT IN WEIHE BASIN AND ADJACENT ZONES BY GPS OBSERVATION
中文刊名：地震学报
英文刊名：Acta Seismologica Sinica
作者：戴王强 ; 任隽 ; 赵小茂 ; 邵辉成 ; 朱桂芝
英文作者：Dai Wangqiang1 ; 2) Ren Jun2) Zhao Xiaomao2) Shao Xuicheng2) Zhu Guizhi3)1) Seismological Institute of Lanzhou ; Lanzhou 730000 ; China 2) Earthquake Administration of Shaanxi Province ; Xi′an 710068 ; China 3) Second Center For Crustal Deformation Monitoring ; China Earthquake Administration ; Xi′an 710054 ; China
中文关键词：鄂尔多斯块体南缘 ; 渭河盆地 ; 地壳运动 ; GPS观测
英文关键词：south border of Ordos block ; Weihe basin ; crustal movement ; GPS measurement
出版日期：2004-06-15
机构：中国地震局兰州地震研究所,陕西省地震局 ,陕西省地震局 ,陕西省地震局 ,中国地震局第二地形变监测中心中国兰州730000,中国西安710068,陕西省地震局 ,中国西安710068,中国西安710068,中国西安710068,中国西安710054
年：2004
期：03
出版单位：地震学报

摘要

利用中国地壳运动观测网络工程 1999～ 2 0 0 2年渭河盆地及邻近地区GPS观测资料 ,以及陕西省地震局 2 0 0 1～ 2 0 0 2年的GPS观测资料 ,研究了渭河盆地及周邻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北东向条带状变化特征 ,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 ,两侧存在一个显著的左旋剪切带 ,其北部区域与铜川—泾阳—临潼—渭南小震频发区有较好的对应关系 .
Based on the GPS data provided by CMONOC during 1999～2002 and observed by Seismological Bureau of Shaanxi Province during 2001～2002, we have obtained the crustal movement velocaity field in Weihe basin and adjacent regions. The results show that the motion velocity in Weihe basin and adjacent zones is characterized by distinct NE directional stripped variation. The south border of Ordos block seems to show an incontinuous anticlockwise rotation on the whole with an average velocity of about 5.7 mm·a 1 relative to Yulin site on the Ordos block. There is a left lateral shear belt on both sides of Binxian—Xi′an—Lantian zone in the central Weihe basin, and its northern area has a better corresponding relationship with the dense zone of small earthquakes in Tongchuan—Jingyang—Lintong—Weinan.

引文

江在森,张希,崔笃信,等.2001.青藏块体东北缘近期水平运动与变形[J].地球物理学报,44(5):636～644
    王琪,张培震,牛之俊,等.2001.中国大陆现今地壳运动和构造变形[J].中国科学,D辑,31(7):529～535
    张培震,王琪,马宗晋,等.2002.青藏高原现今构造变形特征与速度场[J].地学前缘,9(2):442～449
    KingB .2000.GAMITReleases9.92～9.95andGLOBKReleases5.09～5.10[M ].MassachusettsInstituteofTechnology
    XiangHongfa,GuoShunmin,ChenZhitai,etal.1993.RotationalmovementoftheQilianblockandtheregionaltime spacedistributionofearthquakes[A].In:XiangHongfa.ComparisonStudyingofActiveFaultsonChinaFranceCooperation[C].Beijing:SeismologicalPress,84～93
    XuXiwei,ChengGuoliang,MaXingyuan,etal.1994.RotationmodelanddynamicsofblocksinnorthChinaanditsadjacentareas[J].EarthScience—JournalofChinaUniversityofGeosciences,19(2):129～138