MOSAIC9 - Composite sidescan-sonar mosaic collected by the U.S. Geological Survey offshore of the Chandeleur Islands, LA, 2007 (UTM Zone 16N GeoTIFF)

In 2006 and 2007, the U.S. Geological Survey, in partnership with Louisiana Department of Natural Resources and the University of New Orleans, conducted geologic mapping to characterize the sea floor and shallow subsurface stratigraphy offshore of the Chandeleur Islands in Eastern Louisiana. The mapping was carried out during two cruises on the R/V Acadiana. Data were acquired with the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, and an Edgetech 512i chirp subbottom profiling system. The long-term goal of this mapping effort is to produce high-quality geologic maps and geophysical interpretations that can be utilized to investigate the impact of Hurricane Katrina in 2005 and to identify sand resources within the region.2006年至2007年间，美国地质调查局（U.S. Geological Survey）与路易斯安那州自然资源部（Louisiana Department of Natural Resources）及新奥尔良大学（University of New Orleans）合作，针对路易斯安那州东部尚德勒尔群岛（Chandeleur Islands）周边近海海域开展地质填图工作，以精准刻画海底与浅层地下地层的特征。本次填图作业依托“R/V阿卡迪亚号”完成了两次科考航次。本次数据采集采用如下设备：SEA有限公司的SwathPlus干涉声呐（234 kHz）、Klein 3000双频侧扫声呐，以及Edgetech 512i型啁啾海底浅层剖面系统。本次填图工作的长期目标是生成高质量地质图与地球物理解译成果，用于探究2005年卡特里娜飓风（Hurricane Katrina）对该区域的影响，并探明区域内的砂矿资源。