Multibeam echosounder water column data provides a three-dimensional image of features between the surface and seafloor. Although this swath acoustic can be collected over wide range angles, most data, at least beyond to first seafloor return, is contaminated by noise created receiver array sidelobe interference. As result, minimum slant commonly excluded from analysis. This paper demonstrates ...

Analyses of sulfide, methane, oxygen, and CO, in pore-water sampdes from three cold seep sites in Monterey Bay indicate that fluid chemistry is a strong determinant of the distribution of chemolithoautotrophic vesicomyid clams. The distribution of Culyptogena pacijca and Culyptogenu kilmeri were aligned closely with sulfide concentrations at all cold seeps and reflected species-specific capabil...

The Tommeliten seepage area is part of the Greater Ekofisk area, which is situated above the Tommeliten Delta salt diapir in the central North Sea (5629.90 N, 259.80 E, Norwegian Block 1/9, 75 m water depth). Here, cracks in a buried marl horizon allow methane to migrate into overlying clay-silt and sandy sediments. Hydroacoustic sediment echosounding showed several venting spots coinciding wit...

Six species of squat lobsters from a cold seep field in the northeastern South China Sea are studied. Two new species, Uroptychus jiaolongae n. sp. and U. spinulosus n. sp., are described, and their distinctions from the related species are detailed. Two species, Munidopsis tuberosa Osawa, Lin & Chan, 2008 and M. verrilli Benedict, 1902, are herein reported for the first time from a cold seep/h...

Vesicomyid clams, vestimentiferans, and some bathymodiolin mussels from hydrothermal vents and cold seeps possess thiotrophic endosymbionts, high levels of hypotaurine and, in tissues with symbionts, thiotaurine. The latter, a product of hypotaurine and sulfide, may store and/or transport sulfide non-toxically, and the ratio to hypotaurine plus thiotaurine (Th/[H+Th]) may reflect an animal's su...

The use of ocean bottom seismometers provides an effective means studying the process and dynamic cold seeps by continuously recording micro-events produced sub-seafloor fluid migration. We deployed a four-component Ocean Bottom Seismometer (OBS) at active site Haima seep from 6 November to 19 in 2021. Here, we present results this short-term OBS monitoring. first examine record manually distin...

Underground nuclear weapon testing produces radionuclide gases which may seep to the surface. Barometric pumping of gas through explosion-fractured rock is investigated using a new sequentially-coupled hydrodynamic rock damage/gas transport model. Fracture networks are produced for two rock types (granite and tuff) and three depths of burial. The fracture networks are integrated into a flow and...