SEG-Y format of chirp seismic data collected off the southern shore of Martha's Vineyard, MA, 2007

The USGS Woods Hole Science Center conducted a nearshore geophysical survey offshore of the southern coast of Martha's Vineyard, in the vicinity of the Martha's Vineyard Coastal Observatory (MVCO) in August 2007. This mapping program was part of a larger research effort supporting the Office of Naval Research (ONR) Ripples Directed-Research Initiative (DRI) studies at MVCO by providing data collection and modeling. The geophysical data will be used to provide initial conditions for wave and circulation models for the study area. Ultimately, geophysical mapping, oceanographic measurements and modeling will help to improve our understanding of coastal sediment-transport processes. The geophysical mapping utilized a suite of high-resolution instrumentation to map the surficial sediment distribution, depth and sub-surface geology: dual-frequency 100/500 KHz sidescan-sonar system, 234-KHz interferometric sonar, and 500 Hz -12 KHz chirp sub-bottom profiler. The survey was conducted aboard the M/V Megan Miller August 9-13, 2007. The study area covers 35 square kilometers from about 0.2 km to 5-km offshore of the south shore of Martha's Vineyard, and ranges in depth from ~ 5 to 20 meters.2007年8月，美国地质调查局（United States Geological Survey, USGS）伍兹霍尔科学中心（Woods Hole Science Center）在玛莎葡萄园岛（Martha's Vineyard）南部近岸海域，即玛莎葡萄园岛海岸观测站（Martha's Vineyard Coastal Observatory, MVCO）周边区域，开展了近岸地球物理勘测。本次测绘项目隶属于一项更大的科研计划，该计划通过提供数据采集与建模服务，支撑美国海军研究办公室（Office of Naval Research, ONR）在玛莎葡萄园岛海岸观测站开展的“Ripples定向研究计划（Directed-Research Initiative, DRI）”相关研究。本次获取的地球物理数据将为研究区域的海浪与环流模型提供初始条件。最终，地球物理测绘、海洋学观测与建模工作将助力我们深化对海岸沉积物输运过程的认知。 本次地球物理测绘采用了一套高分辨率仪器设备，用于探测表层沉积物分布、水深与地下地质结构：双频100/500千赫侧扫声呐（sidescan-sonar）系统、234千赫干涉声呐（interferometric sonar），以及500赫兹-12千赫啁啾浅地层剖面仪（sub-bottom profiler）。本次勘测于2007年8月9日至13日在“梅根·米勒”号（M/V Megan Miller）机动船上完成。研究区域覆盖玛莎葡萄园岛南岸近岸0.2千米至5千米海域，总面积35平方千米，水深范围约为5至20米。