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USGS GYRE 99002 Sidescan sonar and CHIRP subbottom study area USGS GYRE 99002 Sidescan sonar and CHIRP subbottom tracklines R/V GYRE Evening shot of Auger platform Evening shot of Auger platform
USGS GYRE 99002 Sidescan sonar and CHIRP subbottom study area USGS GYRE 99002 Sidescan sonar and CHIRP subbottom tracklines Deploying SIS-1000 Where's SIS-1000? Weather day Deploying Hi-Res MCS streamer
SIS-1000 Sidescan Sonar Mosaic SIS-1000 Sidescan Sonar Mosaic Huntec fish How many computers does it take to run a cruise? How many computers does it take to run a cruise?
SIS-1000 Sidescan Sonar Mosaic SIS-1000 Sidescan Sonar Mosaic Mud volcano, hemipelagic drape Fault Fault
Mass-waste deposits, young and old Mass-waste deposits, young and old Old slump and Headwall scarp Old slump and Headwall scarp Old slump and Headwall scarp
Mass-waste deposits, young and old Mass-waste deposits, young and old Mass-wasting deposits Mass-wasting deposits Mass-wasting deposits
Click on each figure for a larger image.
A two week cruise aboard the R/V GYRE, during April, 1999, focused on mapping surficial sedimentary processes and their connection to the subsurface geology. The study area was on the upper continental slope in the northwestern Gulf of Mexico; an area of active hydrocarbon exploration. Active salt movement, hydrocarbon movement up faults, the presence of gas hydrates associated with biogenic and thermogenic methane, and overpressured sand deposits all present hazards to oil exploration in this area. This study used sidescan sonar and high-resolution chirp subbottom profiling techniques to map the surficial and shallow subsurface expression of these processes in two areas roughly 15 by 25 km in size. High-resolution multi-channel seismic-reflection data were collected simultaneously with the sidescan imagery to provide a link to the deeper subsurface. Additional multi-channel and Huntec seismic data were collected along regional lines between the detailed study areas to tie these studies to other areas of known hydrates and to wells where shallow overpressured sands have been drilled.

The detailed studies attempted to map entire geological systems in this upper slope environment to provide a broader perspective than can be seen from studying a single lease block. One study area focussed on two adjacent salt withdrawal basins to assess the processes that are shaping the flanks of the basins, the processes affecting sedimentation in the basin floors, and to compare the deeper structures and surficial processes between the basins. The second study area focussed on three salt domes, the processes associated with them, and how they affect the shallow subsurface stratigraphy. Initial observations suggest that most of the surface and shallow subsurface geohazards are associated with the flanks of salt structures. Here active salt movement generates faults along which hydrocarbons can escape to the seafloor, and tectonic oversteepenning generates slope failures.
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Modified Friday, 16-July-1999 15:28:18 EST