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 were processed after data collection. 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2014年执行的“马库斯·G·兰塞斯号”（R/V Marcus G. Langseth）科考航次MGL1407采集所得，采集过程采用LDEO多道地震系统（LDEO Multi-Channel Seismic system），本次航次首席科学家为黛博拉·哈钦森（Deborah Hutchinson）博士，研究人员包括黛博拉·哈钦森博士与纳撒尼尔·米勒（Nathaniel Miller）博士。本数据集文件采用U.K.O.O.A. P1/90格式，包含采集后经处理的地震导航数据。

美国地质调查局（United States Geological Survey, USGS）依托“马库斯·G·兰塞斯号”执行航次MGL1407（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。本次勘探的目标为沿大陆边缘深水区域采集多道地震反射数据，具体分为两项：其一，测定沉积物厚度，助力美国划定大西洋延伸大陆架（Extended Continental Shelf, ECS）；其二，研究大型海底滑坡，以此评估其对美国东海岸基础设施与沿岸社区构成的潜在海啸灾害风险。

本次勘探覆盖大西洋大陆边缘全域，作业范围从大陆坡与上陆隆交汇附近（水深超1500米）延伸至水深超5000米的深海平原区域。本野外科考项目包含两项核心目标：其一，采集所需数据以确定美国大陆架（即延伸大陆架ECS）的外部边界，该边界依据《联合国海洋法公约》第七十六条之规定划定；其二，研究沿大陆边缘搬运的突发性沉积物大规模滑移现象——即海底滑坡，以评估其对大西洋与加勒比海沿岸社区构成的潜在海啸引发风险。相关信息可参考：http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-011-FA