RAPID GPS data acquisition in Jamaica for coseismic and postseismic studies of the Jan. 28, 2020 M=7.7 Oriente Fault earthquake

该RAPID项目将在2020年1月28日发生7.7级地震后，从牙买加及周边岛屿的50个GPS站点收集并提供数据。自2009年以来，已经有四次地震破坏了加勒比海-北美板块边界，东方断层地震是最近的一次，它再次引起了人们对附近古巴南部和人口稠密的牙买加岛的地震危险的担忧，上一次类似的断层破裂是在1907年。这里支持的研究人员将与西印度群岛大学牙买加地震小组的合作者一起收集数据，并将数据存档，供整个社区使用。新数据将与来自法国、古巴、伊斯帕尼奥拉岛和牙买加的科学家组成的团队合作进行分析、建模和解释。这项数据收集工作将为几个不同的研究领域提供基础。该项目将包括大地测量断层滑动解和地震矩的估计。新的大地测量滑动解将用于计算该地区其他地方活动断层的库仑应力变化的震级和模式，这对于评估与2020年地震相关的近期地震风险至关重要。震后滑动解决方案将揭示2020年的地震是否引发了任何沉默的深断层滑动或在东方断层邻近未破裂区域的滑动。精细滑动解将用于预测和研究地震的粘弹性后效应，这将是未来几十年解释和模拟区域GPS速度场的关键。这些新数据以及地震前20年的牙买加GPS数据对于完善下地壳和/或上地幔的粘度估算至关重要，这对于在全球构造活跃地区建模和解释GPS数据至关重要。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This RAPID project will gather and make available data from 50 GPS sites in Jamaica and surrounding islands following the magnitude 7.7 that occurred on January 28, 2020. As the most recent of four earthquakes that have ruptured the Caribbean-North America plate boundary since 2009, the Oriente Fault earthquake has renewed concerns about seismic hazards in nearby southern Cuba and on the densely populated island of Jamaica, where similar faults last ruptured in 1907. The researchers supported here will gather data with collaborators at the Jamaican Earthquake Unit of the University of West Indies and archive the data at UNAVCO, where it will be available to the entire community. The new data will be analyzed, modeled, and interpreted in collaboration with a team that includes scientists from France, Cuba, Hispaniola, and Jamaica.This data collection effort will provide the foundation for several distinct research areas of interest. The project will include an estimation of a geodetic fault-slip solution and earthquake moment. New geodetic slip solution will be used to calculate the magnitude and pattern of Coulomb stress changes across active faults elsewhere in the region, which is critical for evaluating near-term seismic risks associated with the 2020 earthquake. A postseismic slip solution will reveal whether the 2020 earthquake triggered any silent deep fault slip or slip on adjacent unruptured areas of the Oriente Fault. The refined slip solution will be used to predict and study the viscoelastic after-effects of the earthquake, which will be critical for interpreting and modeling the regional GPS velocity field for decades to come. Thew new data along with superb Jamaica GPS data from the two decades before the earthquake will be essential for refining viscosity estimates for the lower crustal and/or upper mantle, which are critical for modeling and interpreting GPS data in tectonically active regions worldwide.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.