Seismic evidence for hotspot-induced buoyant flow beneath the Reykjanes Ridge

Publication Type  Journal Article
Year of Publication  2001
Authors  Gaherty, J. B.
Journal Title  Science
Volume  293
Issue  5535
Pages  1645-1647
Journal Date  Aug 31
ISBN Number  0036-8075
Accession Number  ISI:000170802900059
Key Words  iceland mantle plume; wave-form inversion; anisotropy; pacific; shear; velocities; ocean; segmentation; tomography; rayleigh

Volcanic hotspots and mid-ocean ridge spreading centers are the surface expressions of upwelling in Earth's mantle convection system, and their interaction provides unique information on upwelling dynamics. I investigated the influence of the Iceland hotspot on the adjacent mid-Atlantic spreading center using phase-delay times of seismic surface waves, which show anomalous polarization anisotropy-a delay-time discrepancy between waves with different polarizations. This anisotropy implies that the hotspot induces buoyancy-driven upwelling in the mantle beneath the ridge.


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URL  <Go to ISI>://000170802900059