Locations of All Shotpoints for R/V GYRE Cruise G1-99-GM (99002) - GOM99SHTALLG.SHP

All shotpoint locations from multichannel seismics survey, USGS cruise G1-99-GM

During June 1998 and April 1999, the U.S. Geological Survey (USGS) conducted two research cruises in the northern Gulf of Mexico to acquire high-resolution seismic reflection data across the upper and middle continental slope as part of an investigation of the seismic character, distribution, and potential effects of naturally-occurring marine gas hydrates and related free gas within the gas hydrate stability zone. Over 1600 km of two-dimensional multichannel seismic reflection profiles were acquired during these two cruises. The specific objectives of this investigation are (a) to produce high-resolution images of the gas hydrate stability zone; (b) to study the distribution and character of potential seafloor failures and their relationship to known and inferred gas hydrate deposits; (c) to look at systematic variations in subsurface structure in gas hydrate and non-hydrate areas; and (d) to estimate, if possible, the amounts of hydrates present within the gas hydrate stability zone. The multichannel profiles provide high-quality images with approximately 5 meters of vertical resolution and up to 2 km of penetration. This report gives an overview of the acquisition and data processing of the multichannel seismic reflection profiles and provides references and links to reports with more detailed information. Geologic interpretations of these seismic profiles regarding gas hydrate occurrence and distribution within the study areas of this investigation are given in Cooper and Hart (2002).

美国地质调查局（U.S. Geological Survey, USGS）G1-99-GM航次多道地震勘探的所有炮点位置

1998年6月至1999年4月期间，美国地质调查局（U.S. Geological Survey, USGS）在墨西哥湾北部开展了两次科考航次，采集横跨上、中大陆坡的高分辨率地震反射数据，作为一项研究的组成部分——该研究聚焦于天然气水合物稳定带内天然海洋天然气水合物及相关游离气的地震特征、分布规律及其潜在影响。两次航次共采集了超过1600千米的二维多道地震反射测线。

本研究的具体目标包括：(a) 获取天然气水合物稳定带的高分辨率成像结果；(b) 探究潜在海底滑坡的分布与特征，及其与已发现和推测的天然气水合物矿床之间的关联；(c) 对比分析天然气水合物分布区与非水合物分布区的地下构造系统变化规律；(d) 尽可能估算天然气水合物稳定带内赋存的水合物资源量。

该多道地震测线可提供高质量成像结果，垂直分辨率约为5米，最大探测深度可达2千米。本报告概述了本次多道地震反射测线的采集与数据处理流程，并提供了相关参考文献及指向更详细报告的链接。库珀与哈特（Cooper and Hart, 2002）针对本研究调查区内的地震测线，开展了关于天然气水合物赋存与分布的地质解译工作。