Raw Seismic Navigation Data (P1 format) from the Eastern North American Margin, acquired during R/V Marcus G. Langseth expedition MGL1407 (2014)

This data set was acquired with the LDEO Multi-Channel Seismic system during R/V Marcus G. Langseth expedition MGL1407 conducted in 2014 (Chief Scientist: Dr. Deborah Hutchinson; Investigator(s): Dr. Deborah Hutchinson and Dr. Nathaniel Miller). These data files are of U.K.O.O.A. P1/90 format and include Seismic Navigation data that have not been processed. The USGS conducted a 21-day geophysical survey along the Atlantic continental margin using R/V Marcus G. Langseth, expedition MGL1407 (USGS Field Activity Number 2014-011). The purpose was to collect multichannel seismic reflection data along the deep water portions of the margin (a) to determine sediment thickness and enable the U.S. to delineate the Atlantic extended continental shelf (ECS), and (b) to understand large submarine landslides and therefore assess their potential tsunami hazard for infrastructure and communities living on the Eastern Seaboard. The survey was conducted across the Atlantic continental margin, from near the junction of the slope and upper rise, in water depths greater than 1500 m, out to the abyssal floor in water depths greater than 5000 m. This field program had two primary objectives. 1) To collect the data necessary to establish the outer limits of the U.S. Continental Shelf, or Extended Continental Shelf (ECS), as defined by Article 76 of the Convention of the Law of the Sea. 2) To study the sudden mass transport of sediments down the continental margin as submarine landslides that pose potential tsunamigenic hazards to the Atlantic and Caribbean coastal communities. (http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-011-FA)

本数据集由LDEO多道地震系统采集，采集工作依托2014年执行的马库斯·G·兰塞斯号（R/V Marcus G. Langseth）考察航次MGL1407开展（首席科学家：Deborah Hutchinson博士；研究人员：Deborah Hutchinson博士与Nathaniel Miller博士）。该数据集包含未经处理的地震导航数据，所有数据文件均采用U.K.O.O.A. P1/90格式存储。
美国地质调查局（USGS）曾使用马库斯·G·兰塞斯号（R/V Marcus G. Langseth）执行航次MGL1407（USGS野外活动编号：2014-011），沿大西洋大陆边缘开展了为期21天的地球物理勘探作业。本次勘探的核心目标为沿该边缘的深水区域采集多道地震反射数据，具体任务包括：(a) 探明沉积物厚度，协助美国划定大西洋延伸大陆架（Extended Continental Shelf, ECS）；(b) 研究大型海底滑坡现象，进而评估其对美国东海岸基础设施与沿岸社区的潜在海啸灾害风险。
本次勘探覆盖大西洋大陆边缘全域，范围从陆坡与上隆区的交界附近（水深超过1500米）延伸至水深超过5000米的深海平原区域。本次野外作业包含两项主要目标：1) 依照《联合国海洋法公约》第76条的定义，采集用于确定美国大陆架外缘即延伸大陆架（ECS）边界的必要数据；2) 研究沉积物沿大陆边缘顺坡滑移的突发性大规模输运过程——即海底滑坡，这类滑坡对大西洋及加勒比海沿岸社区存在潜在的海啸孕育风险。
(http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-011-FA)