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Union Seamount: Site of a Flank Crater

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

  1. US Hydrographie Chart No. B.C. 1410 (1969).

  2. Halliday, W., and Scrimger, J. A., Defence Research Establishment Pacific Tech. Mem. 69-11 (1969).

  3. Scrimger, J. A., and Halliday, W., Deep Sea Res. (in the press).

  4. Rittman, A., Volcanoes and their Activity (Interscience, New York, 1962).

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  5. Cotton, C. A., Geol. Soc. Amer. Bull., 80, 749 (1969).

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  6. Herzer, R. H., thesis, Univ. British Columbia (1970).

  7. Scrimger, J. A., and Bird, J., Defence Research Establishment Pacific Tech. Mem. 69-7 (1969).

  8. 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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