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

该项目的总体目标是继续对南美安第斯山脉的形变进行GPS测量，并将形变与地震周期以及俯冲带和长期构造形变的耦合结合起来。这项研究的重要性在于，它考察了俯冲如何创造了现代安第斯山脉并使这一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全球定位系统数据，并与南美洲的其他全球定位系统工作协调；扩大首席研究人员的全球定位系统网络；研究弧后形变和1960年地震的震后影响；以及改进速度估计。P.I.S将模拟与楔形体内俯冲和地幔耦合的应力史相关的长期变形(构造变形)。他们将模拟岩石圈边缘、板块底部、更大规模的地幔流动、板块运动和基准力产生的各种牵引力。他们将研究与岩石圈和地壳俯冲有关的地震形变的分布和性质，特别是1960年的地震，以及与斜向会聚有关的形变。这种GPS测量和地幔流动模拟的结合是试图了解在典型的会聚大陆边缘形成对流的基本地幔作用力。这种多方面的方法(GPS、地震学、建模)将把各种地球动力学成分整合成一个全面的造山过程模型。

0003718O'ConnellThe 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.***