受水准测量和全球导航卫星系统数据制约的中国大陆高精度垂直变形

IF 2.8 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Yanqiang Wu, Guangli Su, Jianliang Nie, Changyun Chen, Zhaohui Chen, Huazhi Yu, Haiquan Yin, Liu Chang, Zheng Tang, Yajin Pang, Hongbao Liang, Wanju Bo
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引用次数: 0

摘要

摘要 采用Helmert联合调整方法,综合精密水准测量和全球导航卫星系统数据,获得了中国大陆高精度、高分辨率的垂直速度。结果表明,除华北平原地下水开采引起的-15.0~-94.2毫米/年的明显下沉外,大部分地区地表垂直速率在-3.0~3.9毫米/年之间,且变形持续。特别是西藏中部和南部、天山、阿拉善、鄂尔多斯、华夏东部和东北地区以 0.5 - 3.9 毫米/年的速率隆起;青藏高原东南部、四川盆地和长江流域以 -3.3 - -0.5 毫米/年的速率地表下沉为主。此外,尽管中国大陆东西部地区水平变形差异明显,但垂直速率差异不大。重力等静压和非构造因素的影响,包括环境质量负荷、冰川等静压调整、孔弹性膨胀/压缩和采矿作业等,部分导致了中国大陆的垂直变形。总体而言,这一速度反映了中国大陆多种地球动力学过程引起的复杂变形特征。这些地球动力过程包括等压、造山运动以及与板块俯冲/板块碰撞相关的地热异常。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-Precision Vertical Deformation of the Chinese Mainland Constrained by Leveling and GNSS data
Summary A high-precision and high-resolution vertical velocity for the Chinese mainland is obtained by integrating precise leveling and GNSS data, using a Helmert joint adjustment method. The results show that the surface vertical rates range between -3.0 and 3.9 mm/yr with continuous deformation in most areas, except the obvious subsidence at the rates of -15.0 to -94.2 mm/yr induced by groundwater exploitation in the North China Plain. Particularly, the central and southern Tibet, Tien Shan, Alashan, Ordos, eastern Cathaysia, and Northeast China uplift at the rates of 0.5 – 3.9 mm/yr; the southeastern Tibetan Plateau, Sichuan basin, and Yangtze block are dominated by surface subsidence at the rates of -3.3 to -0.5 mm/yr. Furthermore, the vertical rates vary little between the eastern and western regions of the Chinese mainland despite their pronounced differences in horizontal deformations. The effects of gravity isostasy and non-tectonic factors, including the environmental mass loads, Glacier Isostatic Adjustment (GIA), poroelastic expansion/compression, and mining operations have partially contributed to the vertical deformation of the Chinese mainland. Overall, this velocity reflects the complicated deformation features induced by the multiple geodynamic processes of the Chinese mainland. These geodynamic processes include isostasy, orogenic processes, and geothermal anomalies associated with slab subduction/plate collision.
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来源期刊
Geophysical Journal International
Geophysical Journal International 地学-地球化学与地球物理
CiteScore
5.40
自引率
10.70%
发文量
436
审稿时长
3.3 months
期刊介绍: Geophysical Journal International publishes top quality research papers, express letters, invited review papers and book reviews on all aspects of theoretical, computational, applied and observational geophysics.
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