This report provides a preliminary summary of geochemical contribution to methane hydrate research and exploration on the Hikurangi Margin, off the northeastern coast of New Zealand from June 20 to July 3, 2006. Geochemical porewater profiles taken from shallow piston cores and vertical fluid migration measured with heatflow probing were compared with seismic summaries of potential deep sediment hydrates deposits. Research goals for this expedition include: (1) Refine geophysical, geochemical, ...
From May 14-20, 2004, piston core and heat flow measurements were collected across two mound structures, mound D and mound F, in an area designated as Atwater Valley, a shallow trough on the continental slope south of the Mississippi Delta. Atwater Valley lies at 1,200 to 1,500 m water depth. Several small mound structures occur in the valley, rising less than 50 m above the surrounding seafloor. The UNOLS vessel ...
We are beginning a new series of laboratory acoustic experiments that will examine the detailed physics of acoustic-elastic scattering. These experiments will measure up-scattered acoustic waves, down-scattered elastic waves, and scattered interface waves from edges and embedded objects using a variety of is sensors. One of our goals is to verify a density-contrast hypothesis upon which the Wedge Assemblage numerical rough-interface scattering model is based and which is applicable to ...
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