Collaborative Research: Vertical Movement in the Southern Alps Constrained by GPS and Absolute Gravity

合作研究：GPS和绝对重力约束下的南阿尔卑斯山垂直运动

• 批准号: 9902981
• 负责人: Roger Bilham
• 金额: $ 6.4万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-10-01 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902981&HistoricalAwards=false
• 关键词: Collaborative; Research; Vertical; Movement; Southern

9902981Bilham This is a collaborative project to measure vertical components of motion across the Southern Alps of New Zealand using both GPS geodesy and absolute gravity. The investigators will install seven continuous or semi-continuous GPS instruments along a profile across the Southern Alps where the range is especially high, and rates of vertical movement should also be high. They will measure g, using the FG5 gravity instrument at 10 sites, both to calibrate and supplement GPS measurements. Five years of data collection should allow a quantification of uplift of benchmarks with respect to sea-level, and a test of whether such uplift is compensated by crustal thickening or a response to erosional unloading. Vertical components of deformation should contribute to understanding two basic processes in continental tectonics; 1) how surface deformation is connected to that at depth, and 2) how climate, through erosion, affects tectonics. The combined use of absolute g and GPS geodesy should allow the PIs to distinguish the extent to which uplift results from the isostatic response to 1) the removal of a surface load and the uplift of the entire crust, or 2) to crustal thickening, for which the rate of thickening should be six to seven times the measured rate of uplift. The work involves extensive collaboration and cost sharing with international colleagues in New Zealand and elsewhere.

9902981Bilham这是一个合作项目，使用GPS大地测量和绝对重力测量新西兰南阿尔卑斯山运动的垂直分量。 研究人员将沿着南阿尔卑斯山脉的剖面安装七个连续或半连续的GPS仪器，那里的范围特别高，垂直运动的速率也应该很高。 他们将在10个地点使用FG 5重力仪测量g，以校准和补充GPS测量。 五年的数据收集应能量化基准相对于海平面的抬升，并测试这种抬升是否因地壳增厚或侵蚀卸载而得到补偿。 变形的垂直分量应有助于理解大陆构造中的两个基本过程：1）地表变形如何与深部变形相联系，以及2）气候如何通过侵蚀影响构造。 绝对重力加速度和GPS大地测量的结合使用应使PI能够区分隆起的程度是均衡响应的结果，1）去除表面载荷和整个地壳的隆起，或2）地壳增厚，增厚的速度应是测量的隆起速度的六到七倍。 这项工作涉及与新西兰和其他地方的国际同事进行广泛合作和分担费用。