Towards a High Resolution, Three-component Velocity Field for the Central Andes

这项研究将利用空间大地测量(GPS和InSAR)来创建过去十年来安第斯山脉中部地壳速度的高空间分辨率三分量图。其主要目标是成像地震间形变场中可能的沿走向变化。虽然震间形变场本身很有趣，可以用来确定俯冲界面的哪些部分被锁定(并可能在未来的地震中破裂)，但目的是对这种变形进行建模，以便将其移除。这项研究试图分离出微妙的低幅度形变，包括：1)最近俯冲带地震后的整体震后松弛。2)与长期造山有关的浅层地壳断裂上的非地震运动。3)深部次地壳储集层中的磁化活动和浅部洞室中的低速率磁化作用。这项研究将使用与以前研究类似的方法(例如Peltzer等人，2001年，Wright等人，2001年)，但将把数据量和空间覆盖范围增加1-2个数量级，从先前研究中使用的10‘S干涉合成孔径雷达数据场景增加到近1,000个场景。该项目还将扩大我们之前对数百座火山的活动性变形的调查，这些活动性变形可能表明火山的岩浆运动，以及进一步评估喷发危险性的必要性。将在这项研究中开发的软件将公开可用。这项研究将涉及研究生和本科生的培训，并将支持一位早期的职业科学家。

Towards a high resolution, three-component velocity field for the central AndesThis study will use space geodetic measurements (GPS and InSAR) tocreate a high spatial resolution, three-component map of crustalvelocity in the central Andes during the past decade. The primarygoal is to image possible along-strike variations in the inter-seismicdeformation field. While the inter-seismic deformation field isinteresting in its own right, and can be used to determine which partsof the subduction interface are locked (and might rupture in futureearthquakes), the objective is to model this deformation so that itcan be removed. This study seeks to isolate subtle low-amplitudedeformation, including: 1) Bulk post-seismic relaxation followingrecent subduction zone earthquakes. 2) Aseismic motion on shallowcrustal faults related to long-term mountain-building. 3) Magmamovements in deep sub-crustal reservoirs and at low rates in shallowchambers. This study will use methods similar to those of previousstudies (e.g., Peltzer et al., 2001, Wright et al., 2001), but willincrease the amount of data and spatial coverage by 1-2 orders ofmagnitude, from the 10's of scenes of InSAR data used in previousstudies to nearly 1000 scenes.This study will help to better characterize hazards from earthquakesin two different environments -- subduction zones and within thecontinents. This project will also extend our previous surveys ofhundreds of volcanoes for active deformation that could indicatemagmatic movements and the need for further assessment of eruptivehazard. The software that will be developed in this study will becomepublicly available. This study will involve the training of graduateand undergraduate students, and will support an early careerscientist.