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

牙买加 RAPID GPS 数据采集，用于 2020 年 1 月 28 日 7.7 级东方断层地震的同震和震后研究

• 批准号: 2022468
• 负责人: Dennis DeMets
• 金额: $ 3.87万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-03-01 至 2021-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2022468&HistoricalAwards=false
• 关键词: RAPID; GPS; data; acquisition; Jamaica

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.

该RAPID项目将在2020年1月28日发生7.7级地震后，收集并提供牙买加和周边岛屿50个GPS站点的数据。作为2009年以来破坏加勒比-北美板块边界的四次地震中最近的一次，Oriente断层地震再次引起人们对附近古巴南部和人口稠密的牙买加岛地震危险的担忧，那里类似的断层上次破裂是在1907年。在此得到支助的研究人员将与西印度群岛大学牙买加地震研究所的合作者一起收集数据，并将数据存档在联合国艾滋病规划署，供整个社区使用。新的数据将被分析，建模，并与一个团队，包括来自法国，古巴，伊斯帕尼奥拉岛和牙买加的科学家合作解释。这种数据收集工作将为几个不同的研究领域提供基础。该项目将包括对大地测量断层滑动解和地震矩的估计。新的大地滑动解将用于计算该地区其他地方活动断层上库仑应力变化的幅度和模式，这对于评估与2020年地震相关的近期地震风险至关重要。震后滑动解决方案将揭示2020年地震是否引发了任何无声的深断层滑动或Oriente断层相邻未破裂区域的滑动。精细化的滑动解将用于预测和研究地震的粘弹性后效，这对于解释和模拟未来几十年的区域GPS速度场至关重要。这些新数据沿着地震前20年牙买加极好的全球定位系统数据，对于精确估计下地壳和/或上地幔的粘度至关重要，该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的智力价值和更广泛的影响审查进行评估来支持的搜索.