Collaborative Research: Integrated Geodetic, Seismological and Geodynamic Studies of Deformation in the Central and Southern Andes

[0003720]该项目的总体目标是继续对南美安第斯山脉的变形进行GPS测量，并将变形与地震周期、俯冲带和较长期构造变形的耦合结合起来。这项研究的重要性在于，它考察了俯冲作用如何形成现代安第斯山脉并使大陆边缘变形的基本机制。具体的研究任务包括：获取和分析来自智利、阿根廷和玻利维亚的GPS数据，并与南美洲的其他GPS工作进行协调；扩大首席研究员的GPS网络；观察弧后形变和1960年地震的震后影响；改进速度估计。P.I.s将模拟与楔体俯冲和地幔耦合的应力历史相关的长期变形（构造变形）。他们将模拟来自岩石圈边缘、板块底部、更大规模的地幔流动、板块运动和基底力的各种牵引力。他们将研究岩石圈和地壳中与俯冲有关的地震变形的分布和性质，特别是1960年的地震，以及与斜辐合有关的变形。GPS测量和地幔流模拟的结合是为了理解在典型的收敛大陆边缘形成对流的基本地幔力。多方面的方法（GPS、地震学、建模）将把各种地球动力学成分整合成一个综合的造山过程模型

0003720SmalleyThe general goals of the project are to continue GPS measurements of deformation in the South American Andes, and to integrate deformation with the earthquake cycle and with coupling on the subduction zone and longer-term tectonic deformation. The importance of the research is that it examines fundamental mechanisms behind how subduction created the modern Andes and deformed this continental margin. Specific research tasks include: obtaining and analyzing GPS data from Chile, Argentina, and Bolivia and coordinating with other GPS efforts in South America; expanding the principal investigator's GPS network; looking at back-arc deformation and at the post-seismic effects of the 1960 earthquake; and improving velocity estimates. The P.I.s will model longer term deformation (tectonic deformation) associated with the stress history of subduction and mantle coupling in the wedge. They will model various tractions arising from the edge of the lithosphere, the base of the plate, larger scale mantle flow, plate motions and basal forces. They will examine the distribution and nature of seismic deformation related to subduction in both the lithosphere and crust, especially the 1960 earthquake, and the deformation associated with oblique convergence.This combination of the GPS measurements and mantle flow modeling is an attempt to understand the fundamental mantle forces that shape convection at an archetypal convergent continental margin. The multifaceted approach (GPS, seismology, modeling) will integrate the various geodynamic components into a comprehensive model of the mountain building process.***