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

为安第斯山脉中部建立高分辨率、三分量速度场

• 批准号: 0510719
• 负责人: Matthew Pritchard
• 金额: $ 32.83万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0510719&HistoricalAwards=false
• 关键词: Towards; Resolution; Three; component; Velocity

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.

为安第斯山脉中部建立高分辨率、三分量速度场本研究将使用空间大地测量（GPS 和 InSAR）来创建过去十年安第斯山脉中部地壳速度的高空间分辨率、三分量图。 主要目标是对地震间变形场中可能的沿走向变化进行成像。 虽然震间变形场本身很有趣，并且可用于确定俯冲界面的哪些部分被锁定（并且可能在未来的地震中破裂），但目标是对这种变形进行建模，以便将其移除。本研究旨在隔离细微的低幅度变形，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地壳断层地震运动。 3）深部地壳下储层中的岩浆运动和浅室中的低速率岩浆运动。 这项研究将使用与以前的研究类似的方法（例如，Peltzer et al., 2001, Wright et al., 2001），但将数据量和空间覆盖范围从 10 个场景增加 1-2 个数量级。之前的研究中使用了近 1000 个场景的 InSAR 数据。这项研究将有助于更好地描述两种不同环境（俯冲带）中地震的危害特征以及各大洲内部。 该项目还将扩展我们之前对数百座火山进行的活动变形调查，这些活动可能表明岩浆运动以及进一步评估喷发危险的必要性。 本研究中开发的软件将向公众开放。这项研究将涉及研究生和本科生的培训，并将支持早期职业科学家。