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 地震横断面 (RISTRA) 项目旨在利用特殊数据集研究美国西南部的地壳和地幔，该数据集由来自 1000 公里横断面 57 个站点的 18 个月宽带远震 IRIS PASSCAL 数据组成1999-2001 年期间记录的德克萨斯州、新墨西哥州、亚利桑那州和犹他州。 在国家科学基金会最初的资助下，完成了广泛的实地工作，数据在 IRIS 数据管理中心进行了处理和存档，并进行了初步分析并向地球科学和更广泛的社区传播。 该项目继续对 RISTRA 进行分析，以前所未有的分辨率阐明和解释与里奥格兰德裂谷 (RGR)、科罗拉多高原 (CP) 和大平原 (GP) 相关的结构和过程。 主要目标是确定： (1) CP 目前高海拔的支撑性质； (2) 与地表形态和构造相关的地幔过程的深度范围； (3) RGR区域下地幔应变与地壳应变之间的联系； (4) 法拉隆板块残余物和任何可能脱离的大陆岩石圈在地幔中的位置。使用接收器函数方法对不连续性进行成像，并与剪切波分裂、3-D 地震层析成像、捕虏岩和其他地质/地球物理约束的研究相结合，以揭示该区域深度约 800 公里的结构。地震偏移处理技术充分利用了 RISTRA 实验的质量、长度和密集（~18 km）台站间距。弹性 2 维和 3 维建模工作正在被纳入与洛斯阿拉莫斯国家实验室和休斯顿大学合作的 DOE/SEG 下一代建模 (NGM) 项目。