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Marine Geophysical Researches

, Volume 6, Issue 2, pp 187–203 | Cite as

Nankai Trough: A hot trench?

  • M. Yamano
  • S. Honda
  • S. Uyeda
Article

Abstract

Heat flow estimated from the gas hydrate layers on the landward slope of the Nankai Trough reveals that heat flow increases downslope toward the trench floor. This data plus six new heat flow values obtained by a conventional probe and two values available from DSDP drill holes give a fairly detailed heat flow distribution in the Nankai Trough area, when combined with the already existing data set. There appears to be a zonal pattern parallel to the trough axis, with a high heat flow zone on the floor of the trough that is quite anomalous for a subduction zone. It might be explained as a result of subduction of the hot portion of the Philippine Sea plate, i.e. the Shikoku Basin, and/or of more local effects such as heating due to intrusion of hot water from subducted sediments to shallow depth beneath the trough floor. Surface heat flow patterns landward of the trough were calculated for a simple thermal model of subduction. Perfect reproduction of the observed zonal pattern is difficult to achieve by the simple model, suggesting the necessity for further heat flow and other observations.

Keywords

Subduction Heat Flow Subduction Zone Zonal Pattern Nankai Trough 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1984

Authors and Affiliations

  • M. Yamano
    • 1
  • S. Honda
    • 1
  • S. Uyeda
    • 1
  1. 1.Earthquake Research InstituteUniv. of TokyoTokyoJapan

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