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Strain Rates and Tectonic Processes in the Track of the Yellowstone Hotspot

黄石热点轨迹的应变率和构造过程

基本信息

批准号：
0745624
负责人：
Robert King
金额：
$ 5.99万
依托单位：
Massachusetts Institute of Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2008
资助国家：
美国
起止时间：
2008-03-01 至 2010-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0745624&HistoricalAwards=false
关键词：
Strain Rates Tectonic Processes Track

项目摘要

Strain Rates and Tectonic Processes in the Track of the Yellowstone Hotspot and Northern Basin and Range This project integrates geodetic, geologic, volcanic and seismologic data along the track of the Yellowstone Hotspot in the Northern Basin and Range to assess extensional deformation processes. The Northern Basin and Range reveals crustal deformation resulting from extension that has been overprinted by Yellowstone volcanism. Hotspot volcanism influences extensional processes in its track through increased heat flow, decreased earthquake activity and mafic dike intrusions over distances of 350 km from the hotspot's current position. The Yellowstone Hotspot has significantly modified the composition of the crust in the Snake River Plain from the surrounding basin and range regions. Several hypotheses have been put forth to explain the pronounced seismic quiescence of the Snake River Plain surrounded by very active regions. The project includes resurveys of 60 GPS monuments and combination of these measurements with an extensive data set covering the Snake River Plain and adjacent basin and range. These measurements are used used to define regions of coherent strain, estimate strain rates, predict fault slip and assess block motions, thereby constraining the tectonic processes within the Northern Basin and Range and track of the Yellowstone Hotspot.

黄石热点和北方盆地和山脉轨迹中的应变率和构造过程该项目综合了北方盆地和山脉中黄石热点轨迹沿着大地测量、地质、火山和地震数据，以评估伸展变形过程。北方盆地和山脉揭示了黄石火山活动叠加的伸展导致的地壳变形。热点火山作用通过增加热流、减少地震活动和距热点当前位置350公里范围内的基性岩脉侵入影响其轨道上的伸展过程。黄石热点地区显著地改变了蛇河平原周围盆地和山脉地区地壳的组成。人们提出了几种假设来解释被非常活跃的地区所包围的斯内克河平原的明显地震平静。该项目包括重新调查60个全球定位系统纪念碑，并将这些测量结果与涵盖斯内克河平原及邻近流域和山脉的广泛数据集相结合。这些测量被用来定义相干应变的区域，估计应变率，预测断层滑动和评估块运动，从而限制了北方盆地和山脉内的构造过程和黄石热点的轨迹。