Collaborative Research: An Integrated Tectonic Study of the Jamaica Strike-slip Restraining Bend and Gonave Microplate Using GPS, Geomorphologic, Seismic, and Gravity Data

合作研究：利用 GPS、地貌、地震和重力数据对牙买加走滑约束弯道和戈纳夫微板块进行综合构造研究

• 批准号: 0609578
• 负责人: Dennis DeMets
• 金额: $ 15.05万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2012-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0609578&HistoricalAwards=false
• 关键词: Collaborative; Research; Integrated; Tectonic; Study

An integrated, four-year geophysical and geological study of the Caribbean island of Jamaica, which straddles a major strike-slip fault restraining bend that has formed in response to partitioning of Caribbean-North America plate motion between the northern and southern boundaries of the Gonave sliver plate, is being carried out by a research team of scientists from the University of Wisconsin and the University of Texas. New geodetic, geomorphologic, paleoseismic, gravity, and seismic measurements are being combined to: (1) measure Caribbean plate motion near Jamaica to establish the full fault slip budget across the island and Gonave microplate motion relative to the Caribbean and North American plates; (2) establish the locations, slip senses, and long-term slip rates along major active Jamaican faults through a combination of geomorphologic, paleoseismologic, and targeted gravity studies; (3) construct and test forward and inverse models of fault slip rates, to distinguish between proposed models for how slip is transferred between the offset fault strands, and to improve earthquake hazard assessment in this densely populated and earthquake-prone country use constraints from all measurements; (4) combine results with GPS site velocities from Hispaniola to derive a model for Gonave microplate motion that is fully consistent with all the data.This project should provide a better understanding of earthquake hazard in Jamaica, which has experienced two destructive earthquakes since 1600 and continues to be vulnerable to significant earthquake damage due to seismic energy focusing and liquefaction of unconsolidated alluvium in much of the heavily populated and economically important southern half of the country. The measurements should provide useful information about the earthquake cycle over range of spatial and temporal scales, including the millenial-scale seismic history and potential of the Plantain Garden fault near the capital city of Kingston to the year-to-year budget of interseismic elastic strain that is accumulating in all areas of the island. The research will be done in collaboration with the Jamaican Seismological Network, which is responsible for seismological network operation, seismic research, and earthquake hazard assessment and response.

加勒比海牙买加岛的一项综合的，四年的地球物理和地质研究跨越了由沃斯·斯洛弗板块的北部和南部边界之间的加勒比海北美板块在分区的响应中形成的主要滑移断层限制弯曲，该弯曲是由沃斯·斯特里弗（Gonave Sliver Plate）的北部和南部边界之间的运动组成的。新的大地测量，地貌，古呼吸，重力和地震测量正在合并为：（1）牙买加附近的加勒比海板运动，以建立相对于加勒比海和北美板块的岛上跨岛上的全断层滑移预算； （2）通过地貌，古介质学和靶向重力研究的结合，建立沿着主要有源牙买加断层的位置，滑动感和长期滑移速率； （3）构造和测试断层滑移速率的前进和反向模型，以区分提议的模型，以在偏移断层链之间传递滑移，并在这个人口稠密的易于地震和地震的国家使用约束中改善地震危险评估与所有测量值； (4) combine results with GPS site velocities from Hispaniola to derive a model for Gonave microplate motion that is fully consistent with all the data.This project should provide a better understanding of earthquake hazard in Jamaica, which has experienced two destructive earthquakes since 1600 and continues to be vulnerable to significant earthquake damage due to seismic energy focusing and liquefaction of unconsolidated alluvium in much of the人口稠密且经济上重要的南部地区。测量值应提供有关地震周期在空间和时间尺度范围内的有用信息，包括千禧年尺度的地震历史以及在金斯敦首都金斯敦附近的车前草花园断层到岛上各个地区积累的经济势弹性菌株预算的年度预算。这项研究将与牙买加地震网络合作进行，该网络组织负责地震网络操作，地震研究以及地震危害评估和反应。