A Wide-Angle Reflection/Refraction Piggyback of the EDGE Chesapeake Bay Transect

EDGE 切萨皮克湾横断面的广角反射/折射

• 批准号: 8917628
• 负责人: W Steven Holbrook
• 金额: $ 15.87万
• 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: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917628&HistoricalAwards=false
• 关键词: Wide; Angle; Reflection; Refraction; Piggyback

The EDGE program (supported by joint Earth and Ocean Sciences funding) is scheduled to collect its second transect of a continental margin in September, 1990 seaward of Chesapeake Bay. Drs. Holbrook and Purdy will simultaneously collect and process wide-angle ocean-bottom refraction data from a second vessel in a "piggy-back" experiment. Their plan is to complement and work in an iterative fashion with the vertical-incidence MCS data in order to: 1) derive accurate 2D velocities across the margin; 2) record lower crust and Moho arrivals; and 3) undershoot a carbonate buildup known to occur deep in the sedimentary section. These data will allow Holbrook and Purdy to: 1) determine Moho geometry; 2) determine the nature of rift-stage crust; 3) improve understanding of the nature of bounding continental and oceanic crust; 4) approach an understanding of the source of the East Coast Magnetic Anomaly; and 5) measure the depth to crystalline basement. Through ray-trace modeling based on existing knowledge of the region, these researchers have developed an optimal design of in which they plan to deploy 9 OBHs (5 digital - 1 day recording length with 120 db range; 4 analog, 10 days, 80 db) along 2 scheduled dip lines that cross known rift-stage basins.

EDGE计划（由地球和海洋科学联合支持） 计划收集其第二个样带， 1990年9月，切萨皮克向海的大陆边缘 湾 霍尔布鲁克博士和珀迪博士将同时收集 处理广角海底折射数据， 在“背驮式”实验中的容器。 他们的计划是 以迭代的方式与 垂直入射MCS数据，以便：1）获得准确的2D 2）记录下地壳和莫霍面 到达;和3）低于已知发生的碳酸盐积累 在沉积层的深处 这些数据将允许 霍尔布鲁克和珀迪：1）确定莫霍面几何; 2）确定 裂谷期地壳的性质; 3）提高对 大陆地壳和大洋地壳边界的性质; 4） 了解东海岸的源头 磁异常; 5）测量结晶深度 地下室 通过基于现有的光线跟踪建模 了解该地区，这些研究人员开发了一种 他们计划部署9个OBH（5 数字- 1天记录长度，120 dB范围; 4个模拟， 沿着2条预定倾斜线， 裂谷期盆地