Peter A. Rona

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Most data used in the study of seafloor hydrothermal plumes consists of sonar (acoustic) scans and sensor readings. Visual data captures only a portion of the sonar data range due to the prohibitive cost and physical infeasibility of taking sufficient lighting and video equipment to such extreme depths. However, visual images are available from research(More)
Visualization and quantification methods are being developed to analyze our acoustic images of thermal plumes containing metallic mineral particles that discharge from hot springs on the deep seafloor. The acoustic images record intensity of backscattering from the particulate matter suspended in the plumes. The visualization methods extract, classify,(More)
Applications of visualization techniques that facilitate comparison of simulation and field datasets of seafloor hydrothermal plumes are demonstrated in order to explore and confirm theories of plume behavior. In comparing these datasets, there is no one-to-one correspondence. We would like to show the comparison by performing quantitative capturing of(More)
Eighty per cent of all mid-ocean spreading centres are slow. Using a mixture of global bathymetry data and ship-board multibeam echosounder data, we explore the morphology of global mid-ocean ridges and compare two slow spreading analogues: the Carlsberg Ridge in the north-west Indian Ocean between 571E and 601E, and the Kane to Atlantis super-segment of(More)
in adult eyes preserved by rapid freezing suggests that the rhabdoms of B. thermydron beyond the first juvenile crab stage may be resistant to the chemical fixation used for anatomical analysis. Rapid freezing of crabs collected remotely under low light conditions at infrequently visited vents may be required to determine the in situ state of adult and(More)
Two active hydrothermal vent sites on the Mid-Atlantic Ridge at 26'N (TAG) and 23"N (Snakepit) have recently been discovered at depths of 37@ and 3500 m, respectively. Although black smokers are present at both siles, their geological settings differ. The TAG area is located on older sedimented crust a few km from the spreading axis, at the junction of the(More)
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