Vertical Movement in the Southern Alps Constrained by GPS

9912071 Molnar该合同为购买四套GPS接收机系统及相关材料和用品提供部分资金。全球定位系统将用于一个合作项目，利用全球定位系统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。牵头机构（马萨诸塞州理工学院）承诺为购置这套全球定位系统提供相应资金（占总费用的32%）。

9912071 MolnarThis award provides partial funding for the purchase of four GPS receiver systems and associated materials and supplies. The GPS systems will be used in 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. The lead institution (Massachusetts Institute of Technology) is committed to providing matching funds (32% of total cost) for the acquisition of this GPS system.***