Collaborative Research: Lithospheric Foundering Beneath the Sierra Nevada

合作研究：内华达山脉下方的岩石圈塌陷

• 批准号: 0454554
• 负责人: George Zandt
• 金额: --
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-03-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0454554&HistoricalAwards=false
• 关键词: Collaborative; Research; Lithospheric; Foundering; Beneath

We are undertaking a major deployment of digital seismograph systems from the EarthScope/USArray Flexible Array instrument pool to investigate the deep structure of the Sierra Nevada mountain range in Eastern California. Forty seismographs will be deployed in two configurations over a 30 month period. The first deployment is a two-dimensional array with about 25km station spacing. This array will be embedded with in the EarthScope/USArray "Transportable Array" footprint. The 70km spacing of the transportable array over a broad area of California and Nevada during their deployment will provide constrains on the regional earth structure. The scientific goals of their experiment include identifying the existence of high density crust and mantle material that may have recently foundered, or delaminated, from the overlying crustal material. This will constrain major hypotheses regarding the evolution of the continental lithosphere. If material has foundered, the constraints that they develop about the deep earth structure, through analysis of seismic waves and wave speeds, will be important information in the development of models to explain the physical and chemical consequences of this process.

我们正在从EarthScope/USAray灵活阵列仪器池中部署数字地震仪系统，以调查加州东部的Sierra内华达州山脉的深层结构。 将在30个月内以两种配置部署40个地震仪。 第一个部署是一个二维阵列，站间距约为25公里。 该阵列将嵌入EarthScope/USAray“可移动阵列”封装中。 在加州和内华达州的广阔区域内，可移动阵列在部署期间的70 km间距将对区域地球结构产生约束。 他们实验的科学目标包括确定高密度地壳和地幔物质的存在，这些物质可能是最近从上覆的地壳物质中沉降或分层的。 这将限制有关大陆岩石圈演化的主要假说。 如果材料已经沉没，通过分析地震波和波速，它们对深层地球结构的约束将是开发模型以解释这一过程的物理和化学后果的重要信息。