Stress Fields in Slabs Penetrating into the Lower Mantle, and Rheology and Composition of the Lower Mantle.

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概要

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• Focal mechanisms of deep-focus earthquakes show compressional stress fields in the deepest part of upper mantle slabs. We examine mechanisms to realize the stress fields using numerical models of slabs interacting with a phase and/or a chemical boundary. The compressional stress field implies that compositional density difference greater than 2% exists at the 660km discontinuity, or that viscosity increases by a factor larger than a few tens and linear-law rheology dominates the flow mechanism in the lower mantle.

• 日本学士院の論文

著者

• Fujimoto Hiromi

  Ocean Research Institute, University of Tokyo

• Fujimoto Hiromi

  Ocean Research Institute University Of Tokyo

• NAKAKUKI Tomoeki

  Ocean Research Institute, University of Tokyo

• Nakakuki Tomoeki

  Ocean Research Institute University Of Tokyo

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