GLORIA/SEABEAM Geophysical Investigation of the Juan Fernandez Microplate at the Pacific-Antarctic-Nazca Triple Junction

GLORIA/SEABEAM 对太平洋-南极-纳斯卡三重交界处的胡安·费尔南德斯微板块进行地球物理调查

• 批准号: 8917941
• 负责人: Martin Kleinrock
• 金额: $ 19.55万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-04-01 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917941&HistoricalAwards=false
• 关键词: GLORIA; SEABEAM; Geophysical; Investigation; Juan

The Juan Fernandez microplate occupies the Pacific, Nazca, Antarctic triple junction, an open--ocean, divergent structure un complicated by hotspots, a seismic ridges or adjacent continents. This setting, coupled with a high magnetic inclination, make this microplate ideal for studying the tectonic evolution of microplates and their relationship with triple junctions. This study will obtain complete ensonification of microplate using the GLORIA side-scan system and will collect Seabeam, magnetics, and gravity data. One of the principal investigators (Schouten) has proposed that microplate motion can be modeled as a circular and rigid body rotating about a "plate specific" pole located on the microplate. This model was developed and tested for the Easter and Galapagos microplates; thus , the work proposed here becomes a test of the "ball-bearing" model, and a test of relative motion solutions previously proposed.

胡安·费尔南德斯微板块位于太平洋、纳斯卡、南极三重交界处，这是一个开放的海洋、发散的结构，没有热点、地震脊或邻近的大陆。这种环境，加上高磁倾角，使该微板块成为研究微板块构造演化及其与三重结关系的理想场所。本研究将使用GLORIA侧扫系统获得微孔板的完整共振，并将收集海浪、磁力和重力数据。其中一位主要研究人员（Schouten）提出，微孔板的运动可以建模为一个圆形刚体围绕位于微孔板上的“特定板”极旋转。这个模型是为复活节和加拉帕戈斯微板开发和测试的；因此，这里提出的工作成为对“球轴承”模型的检验，以及对先前提出的相对运动解的检验。