Seismic Navigation Data (P2 format) from the Eastern North American Margin acquired during the 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 Seismic Navigation data files are of U.K.O.O.A. P2/94 format. 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)

本数据集采用拉蒙特-多尔特地球观测所（Lamont-Doherty Earth Observatory, LDEO）多通道地震系统采集，于2014年搭载研究船“马库斯·G·朗塞斯号”（R/V Marcus G. Langseth）执行航次MGL1407期间获取（首席科学家：德博拉·哈钦森博士；科研人员：德博拉·哈钦森博士与纳撒尼尔·米勒博士）。本次获取的地震导航数据文件采用U.K.O.O.A. P2/94格式存储。美国地质调查局（United States Geological Survey, USGS）曾搭载研究船“马库斯·G·朗塞斯号”（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天的地球物理勘测。本次勘测旨在沿该边缘的深水区采集多通道地震反射数据，具体目标分为两点：(a) 探明沉积物厚度，助力美国划定大西洋扩张大陆架（Extended Continental Shelf, ECS）范围；(b) 研究大型海底滑坡，进而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。本次勘测覆盖大西洋大陆边缘，作业区域始于水深超1500米的陆坡与上部隆升带交界附近，延伸至水深超5000米的深海平原区域。本野外勘测项目包含两项核心目标：1. 依据《联合国海洋法公约》第七十六条之规定，采集用于确定美国大陆架外缘（即扩张大陆架ECS）范围的必要数据；2. 研究沉积物沿大陆边缘顺坡突发大规模运移形成的海底滑坡，这类滑坡对大西洋及加勒比海沿岸社区存在潜在的海啸致灾风险。数据来源：http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-011-FA