Finite-Frequency Tomography Reveals a Variety of Plumes in the Mantle

  • Raffaella Montelli
    Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
  • Guust Nolet
    Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
  • F. A. Dahlen
    Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
  • Guy Masters
    Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
  • E. Robert Engdahl
    Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
  • Shu-Huei Hung
    Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.

抄録

<jats:p> We present tomographic evidence for the existence of deep-mantle thermal convection plumes. <jats:italic>P</jats:italic> -wave velocity images show at least six well-resolved plumes that extend into the lowermost mantle: Ascension, Azores, Canary, Easter, Samoa, and Tahiti. Other less well-resolved plumes, including Hawaii, may also reach the lowermost mantle. We also see several plumes that are mostly confined to the upper mantle, suggesting that convection may be partially separated into two depth regimes. All of the observed plumes have diameters of several hundred kilometers, indicating that plumes convey a substantial fraction of the internal heat escaping from Earth. </jats:p>

収録刊行物

  • Science

    Science 303 (5656), 338-343, 2004-01-16

    American Association for the Advancement of Science (AAAS)

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