Archive of Digital Chirp Subbottom Profile Data Collected During USGS Cruises 09CCT03 and 09CCT04, Mississippi and Alabama Gulf Islands, June and July 2009

In June and July of 2009, the U.S. Geological Survey conducted geophysical surveys to investigate the geologic controls on island framework from Cat Island, Mississippi, to Dauphin Island, Alabama, as part of a broader USGS study of Coastal Change and Transport (CCT). This report serves as an archive of unprocessed digital Chirp seismic reflection data, trackline maps, navigation files, Geographic Information System (GIS) files, Field Activity Collection System (FACS) logs, observer's logbook, and formal Federal Geographic Data Committee (FGDC) metadata. Gained (a relative increase in signal amplitude) digital images of the seismic profiles are also provided.

For more information on the seismic surveys see http://walrus.wr.usgs.gov/infobank/c/c309gm/html/c-3-09-gm.meta.html and http://walrus.wr.usgs.gov/infobank/g/g409gm/html/g-4-09-gm.meta.html

These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean ( http://www.virtualocean.org/) earth science exploration and visualization applications.

2009年6月至7月，美国地质调查局（U.S. Geological Survey，USGS）开展地球物理勘探工作，以探究密西西比州卡特岛至阿拉巴马州多芬岛一带岛屿构架的地质控制因素，该项目属于美国地质调查局海岸变化与输运（Coastal Change and Transport, CCT）综合性研究的组成部分。本报告作为归档资料，包含未处理的数字Chirp地震反射数据（Chirp seismic reflection data）、测线图、导航文件、地理信息系统（Geographic Information System，GIS）文件、野外活动采集系统（Field Activity Collection System，FACS）日志、观测者日志以及正式的联邦地理数据委员会（Federal Geographic Data Committee，FGDC）元数据。同时还提供了经振幅增益处理（信号振幅相对提升）后的地震剖面数字图像。如需了解该地震勘探的更多详情，请访问以下链接：http://walrus.wr.usgs.gov/infobank/c/c309gm/html/c-3-09-gm.meta.html 与 http://walrus.wr.usgs.gov/infobank/g/g409gm/html/g-4-09-gm.meta.html。这些数据还可通过GeoMapApp（http://www.geomapapp.org/）与Virtual Ocean（http://www.virtualocean.org/）这两款地球科学勘探与可视化应用程序获取。