Abstract
LITTLE has been known until recently about the bathymetry of Union Seamount (132° 41′ W, 49° 32′ N). A recent hydro-graphic chart1 indicates a westerly and an easterly summit, at depths of 160 and 290 fathoms respectively, connected by a ridge at about 1,000 fathoms. A survey of the western peak was carried out from the CNAV Endeavour by the Defence Research Establishment Pacific in 1969 (Fig. 1). In the report of that cruise2, and a subsequent publication3, initial reports of indications for the presence of a flank crater are made. Bathymetric data obtained on a cruise of the same ship in late August 1970, when a more detailed survey was made, provide virtual confirmation of the flank crater and sufficient detail for further description of it.
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References
US Hydrographie Chart No. B.C. 1410 (1969).
Halliday, W., and Scrimger, J. A., Defence Research Establishment Pacific Tech. Mem. 69-11 (1969).
Scrimger, J. A., and Halliday, W., Deep Sea Res. (in the press).
Rittman, A., Volcanoes and their Activity (Interscience, New York, 1962).
Cotton, C. A., Geol. Soc. Amer. Bull., 80, 749 (1969).
Herzer, R. H., thesis, Univ. British Columbia (1970).
Scrimger, J. A., and Bird, J., Defence Research Establishment Pacific Tech. Mem. 69-7 (1969).
Budinger, T. F., Deep Sea Res., 14, 191 (1967).
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SCHWARTZ, M., SCRIMGER, J., HALLIDAY, W. et al. Union Seamount: Site of a Flank Crater. Nature Physical Science 230, 20–22 (1971). https://doi.org/10.1038/physci230020a0
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DOI: https://doi.org/10.1038/physci230020a0