Probing the mechanical properties of the crust and upper mantle using geodetic, remote sensing and seismological observations

利用大地测量、遥感和地震观测探测地壳和上地幔的力学特性

• 批准号: 2142152
• 负责人: Jean-Philippe Avouac
• 金额: $ 19.36万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-12-15 至 2023-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2142152&HistoricalAwards=false
• 关键词: Probing; mechanical; properties; crust; upper; Probing; mechanical; properties; crust; upper

The Accomplishments Based Renewal will shed light on the laws that govern continental deformation and the seismic cycle, such as the processes of strain release during large earthquakes and the slow strain build up between successive earthquakes. This topic is of broad interest in geology and the result of the research could significantly advance methods for seismic hazard assessment. These are questions that the recent National Academies of Science, Engineering and Medicine report Earth in Time note as grand challenge questions in the Earth sciences. The researchers will analyze and model high precision GPS measurements of ground deformation before, during and after large earthquakes in California and Tibet using novel methods developed by the lead researcher. The project will support educational and outreach activities by the PI to train students and postdoctoral researcher involved in the project. The project will foster international scientific collaboration.The objective of this project is to advance the knowledge of crustal and upper mantle rheology and to improve the quantitative understanding of how seismicity relates to geodetic strain. The researchers will analyze High-Rate GNSS measurements of postseismic deformation and aseismic transients using a new methodology based on an Independent Component Analysis technique. They will compare the geodetic and seismicity observations with model predictions to constrain the friction properties governing the earthquake nucleation process and aseismic slip, and the viscosity structure. They will analyze data from California, related to the 2019, Mw7.1 Ridgecrest earthquake and the 2020 Westmorland swarm in particular, and data related to the Mw 7.4, 2021a Madoi earthquake in Tibet.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

基于成就的更新将阐明控制大陆变形和地震循环的定律，例如大地震期间的应变释放过程以及在连续地震之间的缓慢应变。该主题在地质学上具有广泛的兴趣，研究的结果可以大大推动地震危险评估的方法。这些是最近国家科学，工程和医学学院的问题，该问题是《地球科学》中的大挑战问题。研究人员将使用主要研究人员开发的新方法来分析和建模在加利福尼亚和西藏大地震之前，之中和之后，对地面变形的高精度GPS测量。该项目将支持PI的教育和外展活动，以培训参与该项目的学生和博士后研究人员。该项目将促进国际科学合作。该项目的目的是促进地壳和上地幔风湿病的知识，并提高对地震性与大地测量应力关系的定量理解。研究人员将使用基于独立的组件分析技术的新方法来分析高速GNSS的高速GNSS测量。他们将将大地和地震性观测值与模型预测进行比较，以限制控制地震成核过程和无性滑移以及粘度结构的摩擦特性。他们将分析来自加利福尼亚州的数据，与2019年，MW7.1 Ridgecrest地震和2020 Westmorland群有关，以及与MW 7.4，2021a Madoi在西藏的数据有关的数据。这项奖项反映了NSF的法定任务，并通过评估了基金会的智力效果，并通过评估了NSF的法定任务。