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Titolo:
Mapping the Hawaiian plume conduit with converted seismic waves
Autore:
Li, X; Kind, R; Priestley, K; Sobolev, SV; Tilmann, F; Yuan, X; Weber, M;
Indirizzi:
Geoforschungszentrum Potsdam, D-14473 Potsdam, Germany Geoforschungszentrum Potsdam Potsdam Germany D-14473 73 Potsdam, Germany Free Univ Berlin, FR Geophys, D-12249 Berlin, Germany Free Univ Berlin Berlin Germany D-12249 Geophys, D-12249 Berlin, Germany Univ Cambridge, Bullard Labs, Dept Earth Sci, Cambridge CB3 0EZ, England Univ Cambridge Cambridge England CB3 0EZ Sci, Cambridge CB3 0EZ, England Univ Potsdam, Inst Geowissensch, D-14415 Potsdam, Germany Univ Potsdam Potsdam Germany D-14415 wissensch, D-14415 Potsdam, Germany
Titolo Testata:
NATURE
fascicolo: 6789, volume: 405, anno: 2000,
pagine: 938 - 941
SICI:
0028-0836(20000622)405:6789<938:MTHPCW>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
UPPER-MANTLE; VOLCANISM; VELOCITY; ORIGIN; MELT; LITHOSPHERE; TOMOGRAPHY; HOTSPOT; WATER; TIBET;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Kind, R Geoforschungszentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany Geoforschungszentrum Potsdam Telegrafenberg Potsdam Germany D-14473
Citazione:
X. Li et al., "Mapping the Hawaiian plume conduit with converted seismic waves", NATURE, 405(6789), 2000, pp. 938-941

Abstract

The volcanic edifice of the Hawaiian islands and seamounts, as well as thesurrounding area of shallow sea floor known as the Hawaiian swell, are believed to result from the passage of the oceanic lithosphere over a mantle hotspot(1-3). Although geochemical and gravity observations indicate the existence of a mantle thermal plume beneath Hawaii(4-6), no direct seismic evidence for such a plume in the upper mantle has yet been found. Here we present an analysis of compressional-to-shear (P-to-S) converted seismic phases, recorded on seismograph stations on the Hawaiian islands, that indicate azone of very low shear-wave velocity (< 4 km s(-1)) starting at 130-140 kmdepth beneath the central part of the island of Hawaii and extending deeper into the upper mantle. We also find that the upper-mantle transition zone(410-660 km depth) appears to be thinned by up to 40-50 km to the south-southwest of the island of Hawaii. We interpret these observations as localized effects of the Hawaiian plume conduit in the asthenosphere and mantle transition zone with excess temperature of similar to 300 degrees C. Large variations in the transition-zone thickness suggest a lower-mantle origin of the Hawaiian plume similar to the Iceland plume(7), but our results indicate a 100 degrees C higher temperature for the Hawaiian plume.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 00:25:39