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Sio Guyot: A complex volcanic edifice in the western Mid-Pacific Mountains

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Abstract

Sio Guyot, in the westernmost edge of the Mid-Pacific Mountains, is a large, complex volcanic edifice rising to more than 1200 m below sea level. The summit is divided into two flat-topped areas by a WNW-trending sediment-filled trough. Seismic reflection profiles reveal three acoustic units: an upper transparent layer (pelagic cap), a lower opaque layer (reef- and lagoon-derived sediments), and an acoustic (volcanic) basement. Free-air gravity anomalies indicate three eruptive centers or conduits within the main edifice, which apparently was constructed during late Cretaceous time on a broad basement swell or plateau that today is more than 3400 m below sea level (1500 m above regional abyssal depths).

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Author notes

  1. Kenji Nemoto

    Present address: Department of Marine Resources, Faculty of Marine Science and Technology, Tokai University, 1000-Orido, 424, Shimizu, Shizuoka, Japan

Authors and Affiliations

  1. Hawaii Institute of Geophysics, University of Hawaii, 96822, Honolulu, HI

    Kenji Nemoto & Loren W. Kroenke

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  1. Kenji Nemoto
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  2. Loren W. Kroenke
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Nemoto, K., Kroenke, L.W. Sio Guyot: A complex volcanic edifice in the western Mid-Pacific Mountains. Geo-Marine Letters 5, 83–89 (1985). https://doi.org/10.1007/BF02233932

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  • DOI: https://doi.org/10.1007/BF02233932

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