Global distribution of seamounts from ship-track bathymetry data

Details Global distribution of seamounts from ship-track bathymetry data Global distribution of seamounts from ship-track bathymetry data

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3413304h&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 13, CiteID L13304

Physics

Geophysics

7

Marine Geology And Geophysics: Seafloor Morphology, Geology, And Geophysics, Marine Geology And Geophysics: Submarine Tectonics And Volcanism, Tectonophysics: Tectonics And Magmatism, Volcanology: Mid-Oceanic Ridge Processes (1032, 3614)

Scientific paper

The distribution of submarine volcanoes, or seamounts, reflects melting within the Earth and how the magma generated ascends through the overlying lithosphere. Globally (+/-60° latitude), we use bathymetry data acquired along 39.5 × 106 km of ship tracks to find 201,055 probable seamounts, an order of magnitude more than previous counts across a wider height-range (0.1 < h < 6.7 km). In the North Pacific, seamounts' spatial distribution substantially reflects ridge-crest conditions, variable on timescales of 10 s of Ma and along-ridge distances of ~1,000 km, rather than intra-plate hot-spot related volcanic activity. In the Atlantic, volcano numbers decrease, somewhat counter-intuitively, towards Iceland suggesting that abundant under-ridge melt may deter the formation of isolated volcanoes. Neither previously used empirical curve (exponential or power-law) describes the true size-frequency distribution of seamounts. Nevertheless, we predict 39 +/- 1 × 103 large seamounts (h > 1 km), implying that ~24,000 (60%) remain to be discovered.

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