Mantle Deformation From Seismic Anisotropy

地震各向异性引起的地幔变形

• 批准号: 9316457
• 负责人: Paul Silver
• 金额: $ 10万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-15 至 1996-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316457&HistoricalAwards=false
• 关键词: Mantle; Deformation; Seismic; Anisotropy

9304560 Silver This PASSCAL field project will examine the deep structure of the South American Altiplano, one of the world's highest and largest plateaus with an average elevation of nearly 4 km, a crustal thickness of 65 km and area of over 600,000 square km at the intersection of southern Peru, western Bolivia, and northern Chile. The investigation will test theories of formation of this plateau and of mountain-building in general. The investigators will deploy 20 PASSCAL seismic stations across the region to determine variations in crustal thickness, structure of the underlying mantle wedge, and shear wave splitting which is an indication of the fabric and distortion history of the rock. A collaboration in deployment and analysis is planned with the French ORSTOM Program and with South American scientists. This active seismic area, where the oceanic plate is subducted under the continent, is an analog to the U.S. Pacific Northwest tectonic regime. This research is a component of the National Earthquake Hazard Reduction Program. ***

9304560银 这一PASSCAL实地项目将研究南美洲高原的深层结构，该高原是世界上最高和最大的高原之一，平均海拔近4公里，地壳厚度65公里，面积超过60万平方公里，位于秘鲁南部、玻利维亚西部和北方智利的交界处。 调查将测试理论的形成这一高原和山区建设的一般。 调查人员将在整个地区部署20个PASSCAL地震站，以确定地壳厚度的变化，底层地幔楔的结构，以及剪切波分裂，这是岩石结构和变形历史的指示。 计划与法国ORSTOM方案和南美科学家合作进行部署和分析。 这个活跃的地震区，海洋板块俯冲到大陆之下，类似于美国太平洋西北部的构造体系。 这项研究是国家地震减灾计划的一个组成部分。 ***