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

R. Montelli | Zendy; Guust Nolet | Zendy; F. A. Dahlen | Zendy; G. Masters | Zendy; E. R. Engdahl | Zendy; S. Hung | Zendy

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

Author(s) -

R. Montelli,

Guust Nolet,

F. A. Dahlen,

G. Masters,

E. R. Engdahl,

S. Hung

Publication year - 2003

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1092485

Subject(s) - geology , mantle (geology) , convection , mantle plume , mantle convection , geophysics , hotspot (geology) , plume , seismic tomography , thermal , tomography , seismology , mechanics , meteorology , tectonics , subduction , lithosphere , physics , optics

We present tomographic evidence for the existence of deep-mantle thermal convection plumes. P-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.

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