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.

来自威斯康星州和得克萨斯州大学的一个科学家研究小组正在对加勒比牙买加岛进行为期四年的地球物理和地质综合研究。牙买加岛横跨一个主要的走滑断层，该断层限制了因加勒比-北美板块运动在戈纳夫银板块的北方和南方边界之间分开而形成的弯曲。新的大地测量、地貌、古地震、重力和地震测量正在结合起来：（1）测量牙买加附近的加勒比板块运动，以确定整个岛屿的完整断层滑动预算和戈纳夫微板块相对于加勒比和北美板块的运动;（2）通过地貌、（3）构造和测试断层滑动速率的正演和反演模型，区分断层错动带之间滑动如何传递的拟议模型，并利用所有测量的约束条件改进这个人口密集和地震多发国家的地震危险性评估;（4）将联合收割机的结果与伊斯帕尼奥拉岛的GPS站点速度结合起来，推导出一个与所有数据完全一致的Gonave微板块运动模型。该地区自1600年以来经历了两次破坏性地震，由于地震能量集中和松散冲积层液化，国家这些测量应能提供有关各种空间和时间尺度的地震周期的有用信息，包括千年尺度的地震历史和首都金斯顿附近的芭蕉园断层的潜力，以及该岛所有地区正在积累的震间弹性应变的逐年预算。这项研究将与牙买加地震网络合作进行，该网络负责地震网络的运作、地震研究以及地震危险评估和反应。