Rapid Response Research (RAPID) Proposal for the April 4, 2010 Mw 7.2 El Mayor-Cucapah Earthquake, Northern Baja California, Mexico

该项目的重点是与2010年4月4日Sierra El Mayor-Cucapah Mw7.2地震有关的墨西哥下加利福尼亚州北方正在进行的地壳运动。 该项目正在利用位于下加利福尼亚北方的新的连续全球定位系统（CGPS）台站来测量地震后的瞬时地壳运动。 新的6站网络补充和加强了EarthScope PBO网络，为研究岩石圈流变学和监测下北方和加州南部的地震灾害提供了所需的数据。 目前正在开发一个关于六个新的CGPS台站的震前地壳速度的模型，以便利用过去二十年来收集的现有全球定位系统活动测量数据，与震后运动进行直接比较。 来自连续的全球定位系统台站的新数据和对震前地壳速度的精确估计正在成为评价地震对速度场造成的扰动的基础，包括确定与地震有关的速度变化估计的实际不确定性。 这些大地测量的结果，使一个强大的研究地壳和地幔流变学的作用，地震后的过程中发挥的地壳应力在南部加州和北方墨西哥的演变，与地震灾害评估的影响。 该项目正在帮助支持亚利桑那大学的一名博士生，并正在加强与我们在CICESE的墨西哥合作者的科学联系，他们是我们在地震科学和与南部圣安德烈亚斯断层系统相关的灾害研究方面的天然合作伙伴。

This project is focusing on ongoing crustal motions in northern Baja Califorrnia, Mexico, associated with the 4 April 2010 Mw7.2 Sierra El Mayor-Cucapah earthquake. The project is utilizing new continuous GPS (CGPS) stations located in northern Baja California to measure transient crustal motions following the earthquake. The new 6-station network complements and enhances the EarthScope PBO network, providing needed data for studies of lithospheric rheology and for monitoring earthquake hazards in northern Baja and southern California. A model for pre-earthquake crustal velocities at the six new CGPS stations is being developed for direct comparison with post-earthquake motions, using existing campaign GPS measurements collected over the past two decades. New data from the continuous GPS stations and precise estimates for pre-earthquake crustal velocities are forming the basis for an evaluation of perturbations to the velocity field caused by the earthquake, including determination of realistic uncertainties in the earthquake-related velocity change estimates. These geodetic results are enabling a robust study of crust and mantle rheology and the role that postseismic processes play in the evolution of crustal stresses in southern California and northern Mexico, with implications for earthquake hazards assessment. This project is helping to support one PhD student at The University of Arizona, and is strengthening scientific ties with our Mexican collaborators at CICESE, who are our natural partners in earthquake science and hazard research associated with the southern San Andreas fault system.