Bathymetry of Three Deep-sea Channels in the Northeast and Central Tufts Abyssal Plain

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  • MORLEY J. J.
    National Oceanic and Atmospheric Administ-ration, National Ocean Survey
  • POTTER K. W.
    National Oceanic and Atmospheric Administ-ration, National Ocean Survey
  • IWABUCHI Y.
    Hydrographic Department, Maritime Safety Agency, Ministry of Transportation
  • ELVERS D. J.
    National Oceanic and Atmospheric Administ-ration, National Ocean Survey

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  • Tufts深海平原北東部および中央部に発達する3系統の深海長谷の地形について

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Description

The drainage pattern in the northeast and central Tufts Abyssal Plain isdescribed in detail. Satellite navigation on the systematic survey has allowed precise location of the major channel systems of the northeast Pacific Ocean. Two hundred channel profiles were collected from the echograms showing the Moresby-Scott, Mukluk, and Horizon Channel Systems trending in either a southwestward or westward direction across this section of the Tufts Plain. The channel profiles illustrate the prominence of the higher and wider righthand levee (facing downstream). The Moresby-Scott Channel System disperses in the form of several distributaries throughout the area studied, and is probably responsiblefor much of the sediment deposits. Unlike the Moresby-Scott, the Mukluk extends throughout the survey area as a solitary channel with one minor branch. The Horizon Channel crosses the Sedna Fracture Zone east of the Sedna Seamount and terminates in distributary fashion in the central portion of the Tufts Plain. The Moresby-Scott, Mukluk, and Horizon Channels form one major system which encompasses the entire northeast and central Tufts Abyssal Plain.

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