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学科主题: 地球科学::地质学
题名: 藏南地区现今运动学特征的连续GPS观测研究
作者: 张智慧
答辩日期: 2009-06-04
导师: 刘静
专业: 构造地质学
授予单位: 中国科学院研究生院
授予地点: 北京
学位: 硕士
关键词: 藏南地区 ;  运动学特征 ;  连续GPS观测
索取号: S000025
部门归属: 图书馆
摘要: 选择现今地壳形变研究程度相对较低的藏南地区,布设了连续GPS观测网络,以监测该地区现今运动学特征。已有站点6个,2006年11月—2008年10月的初步观测结果显示:相对稳定的欧亚板块,拉萨地块总体具有往东、往北运动趋势;各观测站点东向分量普遍高于北向分量,是北向分量的2倍甚至更高;拉萨地块自西向东,东向速率增大,反应了明显的东西向拉张,自南向北,北向运动速率变小,体现了该地区南北向缩短运动;位于拉萨市的IGS观测站LHAZ与仲巴县亚热乡YARE站间东西向拉张速率约11±2mm/yr;亚东-谷露与申扎-定结两正断裂系的整体拉张速率7-9mm/yr;雅鲁藏布江缝合带其东、中、西三段的运动方式不同,目前能推定的是,雅鲁藏布江缝合带的中部,以汇聚为主,其吸收了4-5mm/yr的南北向的碰撞缩短运动分量,西部可能存在南北向的拉张运动;解算结果显示雅鲁藏布江缝合带具有右旋走滑运动分量,右旋走滑速率在2-5mm/y;对于喜玛拉雅以北的藏南地区,TigiCAS连续GPS观测站,各站点位移的垂向和北向分量呈现季节性变化特征,垂向和北向分量在每年的7-8月份达到最低值,而在每年的1-2月份到达最大值。该特征可能是对喜玛拉雅山前季风降水在夏季剧增(质量加载)和冬季最少(质量卸载)下地壳弹性形变的响应。
英文摘要: 6 continuous GPS stations have been built in southern Tibetan region to monitor its present-day kimatics characteristical which is key important but less studied. Preliminary observation from 2006 to 2008 shows that :(1)There is a north-eastward movement in sothern Tibet. East components of those movement are nearly or even twice more than northern’s in that regions. (2)From west to east, the eastward rate are increaing with north component rarely.Contrast to east components, those north rate incresing from south to north..(3) There is a east-west extension in Lhasa block.extesion rate between LHAZ (IGS station in Lhasa ) and YARE (in west of xigaze ) is 11±2mm/yr.(4)the overall extension rate between Yadong-Gulo rift and Shezha –Dingjie rift is 7-9mm/y.(5) Convege rate along Yalong-zangbo suture is may subparagraph. The central part are convegeing with a rate 4-5mm/y across the suture.Contrast to the central part, the west part of the suture may have a NE-SW ward extension movement. (6) The Yalong-zangbo suture is a rightl-lateral active fault, the right-lateral rate is 2-5mm/yr.(7)The displacements of all continuous GPS observation stations in southern Tibetan region show a seasonal variation character. All those U and N components reduce to the lowest level in July-August and increase to their high points in Jan.-Feb. It may be a response to mass loading and unloading in front of Himalayan which may indicate crustal’s elastic deformation of these regions.
语种: 中文
内容类型: 学位论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/1218
Appears in Collections:图书馆_学位论文

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Recommended Citation:
张智慧.藏南地区现今运动学特征的连续GPS观测研究[硕士].北京.中国科学院研究生院.2009
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