Geodetic Expressions of Plate Boundary Zone Dynamics from EarthScope Facilities

来自 EarthScope 设施的板块边界带动力学的大地测量表达式

• 批准号: 0843096
• 负责人: Richard Bennett
• 金额: $ 20.31万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0843096&HistoricalAwards=false
• 关键词: Geodetic; Expressions; Plate; Boundary; Zone

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).We are using new continuous GPS and seismic data products from EarthScope facilities to investigate possible dynamic links between vertical crustal motions and lithospheric structure. We are combining PBO and PBO NUCLEUS data with GPS data from a large network of globally distributed stations and analyzing the combined data set using the latest geodetic models, including IGS absolute phase centers. Our goal is to create high-precision regional-scale images of the vertical velocity field throughout the EarthScope focus area. In order to characterize and improve the precision of the GPS vertical rate estimates, we are developing new time series analysis methods. To interpret the vertical velocity field, we are developing new inverse analysis methods based on the flexure of elastic plates. The model parameters that we are investigating include vertical loads and load rates and (possibly time dependent) strength of the continental lithosphere. EarthScope seismic deployments are providing images of the structure of the continental lithosphere composing the deformed plate boundary zone, adding constraints on seismic velocity, density, attenuation, and anisotropy structure. The combination of geodetic and seismologic data sets should have implications for models of instantaneous mantle flow, ongoing postseismic stress relaxation, and other processes. Pilot study regions include southern California and central Utah, and similar areas where data sets are currently the strongest. Ultimately we anticipate applying the technique across the entire western conterminous US region. The associations between vertical motions, lithosphere structure, and dynamics that we are establishing constitute only one of many important avenues of scientific investigation that require precise constraints on vertical crustal motions. We anticipate that the vertical motion data products and analysis tools that we generate will have wide application concurrent with and beyond our two-year project. Our research team includes an early career female research scientist and a female PhD student.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。我们正在使用EarthScope设施的新的连续GPS和地震数据产品，以调查垂直地壳运动和岩石圈结构之间可能的动态联系。 我们正在将PBO和PBO NUCLEUS数据与来自全球分布的大型台站网络的GPS数据相结合，并使用最新的大地测量模型（包括IGS绝对相位中心）分析组合数据集。我们的目标是创建高精度的区域尺度图像的垂直速度场在整个EarthScope的重点领域。 为了表征和提高GPS垂直速率估计的精度，我们正在开发新的时间序列分析方法。 为了解释垂直速度场，我们正在发展新的基于弹性板弯曲的反分析方法。 我们正在调查的模型参数包括垂直载荷和载荷率和（可能与时间有关）大陆岩石圈的强度。 EarthScope地震部署提供了构成变形板块边界带的大陆岩石圈结构的图像，增加了对地震速度、密度、衰减和各向异性结构的限制。 大地测量和地震数据集的结合应该对瞬时地幔流动、持续的震后应力松弛和其他过程的模型有影响。 试点研究区域包括加州南部和犹他州中部，以及数据集目前最强的类似地区。 最终，我们预计在整个美国西部接壤地区应用该技术。 我们正在建立的垂直运动、岩石圈结构和动力学之间的联系，仅仅是需要对地壳垂直运动进行精确约束的许多重要科学研究途径之一。 我们预计，垂直运动数据产品和分析工具，我们产生的将有广泛的应用，同时和超越我们的两年项目。 我们的研究团队包括一名早期职业女性研究科学家和一名女博士生。