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Probing South Pacific mantle plumes with ocean bottom seismographs

Abstract : The seismic structure beneath the South Pacific superswell has not been well explored in spite of its significance for mantle dynamics. The region is characterized by a topographic high of more than 680 m [Adam and Bonneville, 2005]; a concentration of hot spot island chains (e.g., Society Cook-Austral, Marquesas, and Pitcairn) whose volcanic rocks have isotopic characteristics suggesting deep mantle origin; and a broad, low-velocity anomaly in the lower mantle that has been revealed by seismic tomographyThese observations suggest the presence of a large-scale mantle flow from the bottom of the mantle beneath the region, which is called a ‘superplume’ [McNutt, 1998[.
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Submitted on : Tuesday, March 8, 2022 - 10:07:57 AM
Last modification on : Tuesday, May 17, 2022 - 3:12:03 PM
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D. Suetsugu, H. Sugioka, T. Isse, y. Fukao, H. Shiobara, et al.. Probing South Pacific mantle plumes with ocean bottom seismographs. EOS, 2005, 86, pp.429-435. ⟨10.1029/2005EO440001⟩. ⟨insu-03601120⟩

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