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

这个快速项目将在2020年1月28日发生7.7级地震后，收集并提供牙买加及周边岛屿50个GPS站点的数据。自2009年以来，加勒比-北美板块边界发生了四次破裂的地震，其中最新的一次是Oriente断层地震，这场地震再次引发了人们对邻近的古巴南部和人口稠密的牙买加岛上地震危险的担忧，类似的断层上一次破裂是在1907年。在这里得到支持的研究人员将与西印度群岛大学牙买加地震组的合作者一起收集数据，并将数据存档到联安部队，在那里将向整个社区提供这些数据。新的数据将与一个包括来自法国、古巴、伊斯帕尼奥拉和牙买加的科学家的团队合作进行分析、建模和解释。这一数据收集工作将为几个不同的感兴趣的研究领域提供基础。该项目将包括对大地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活动断层上库仑应力变化的幅度和模式，这对于评估与2020年地震相关的短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静默的深部断层滑动或在毗邻的未破裂的Oriente断层地区滑动。精化的滑移解将被用于预测和研究地震的粘弹性后效，这对未来几十年的区域GPS速度场的解释和模拟将是至关重要的。地震前二十年的新数据和出色的牙买加GPS数据将对精炼下地壳和/或上地幔的粘度估计至关重要，这对全球构造活动区的GPS数据建模和解释至关重要。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势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.