Seismic Evidence for Hotspot-Induced Buoyant Flow Beneath the Reykjanes Ridge

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Science  31 Aug 2001:
Vol. 293, Issue 5535, pp. 1645-1647
DOI: 10.1126/science.1061565

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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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