Colorado Plateau/Rio Grande Rift/Great Plains Seismic Transect

科罗拉多高原/里奥格兰德裂谷/大平原地震断面

• 批准号: 0207812
• 负责人: Richard Aster
• 金额: $ 10.56万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2004-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207812&HistoricalAwards=false
• 关键词: Colorado; Plateau; Rio; Grande; Rift

EAR-0207812 Aster The Rio Grande Rift Seismic Transect (RISTRA) project is designed to study the crust and mantle beneath the southwestern U.S. utilizing an exceptional data set consisting of 18 months of broadband teleseismic IRIS PASSCAL data from 57 sites along a 1000-km transect in TX, NM, AZ, and UT recorded during 1999-2001. Under initial NSF funding extensive fieldwork was completed, data were processed and archived at the IRIS data management center, and preliminary analysis was performed and disseminated to the earth science and broader communities. This project continues the analysis of RISTRA to illuminate and interpret structure and processes associated with the Rio Grande Rift (RGR), Colorado Plateau (CP), and Great Plains (GP) at unprecedented resolution. Principal goals are to determine the: (1) nature the support of the present high elevation of the CP; (2) depth extent of mantle processes associated with surface morphology and tectonics; (3) connection between mantle and crustal strain beneath the RGR region; (4) location in the mantle of remnants of the Farallon plate and any possible detached continental lithosphere. Imaging of discontinuities using receiver function methods is being coupled with studies of shear wave splitting, 3-D seismic tomography, xenolith, and other geological/geophysical constraints to reveal the structure of the region to depths of approximately 800 km. Seismic migration processing techniques that take full advantage of the quality, length, and dense (~18 km) station spacing of the RISTRA experiment are being applied. Elastic 2- and 3-D modeling efforts are being incorporated into the DOE/SEG Next Generation Modeling (NGM) Project in association with Los Alamos National Laboratory and the University of Houston.

EAR-0207812 ASTER RIO GRANDE RIFT地震样带（RISTRA）项目旨在研究美国西南部下方的地壳和地幔，利用了一个非凡的数据集，该数据集包含18个月的宽带Telesesissic Iris Passcal数据，来自57个站点的57个地点，沿TX，NM，NM，NM，AZ，AZ，IT ut conderial consect in 57个地点，并在57个站点中进行了录制。 根据最初的NSF资金，完成了广泛的现场工作，在IRIS数据管理中心进行了处理和存档数据，并对地球科学和更广泛的社区进行了初步分析。 该项目继续对Ristra进行分析，以照亮和解释与Rio Grande Rift（RGR），Colorado Plateau（CP）和Great Plains（GP）相关的结构和过程。 主要目标是确定：（1）自然界对CP的高海拔高度的支持； （2）与表面形态和构造相关的地幔过程的深度； （3）RGR区域下面的地幔与地壳菌株之间的连接； （4）位于法拉隆板块残留物和任何可能脱离的大陆岩石圈的位置。使用接收器函数方法对不连续性进行成像，与剪切波分裂，3-D地震层析成像，异种石和其他地质/地质物理约束的研究相结合，以揭示该区域的结构至约800 km的深度。充分利用Ristra实验的质量，长度和密度（约18 km）站间距的地震迁移处理技术正在应用。与洛斯阿拉莫斯国家实验室和休斯顿大学联合的弹性2和3-D建模工作已纳入DOE/SEG下一代建模（NGM）项目。