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Science 31 August 2001:
Vol. 293. no. 5535, pp. 1645 - 1647
DOI: 10.1126/science.1061565
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Reports
Seismic Evidence for Hotspot-Induced Buoyant Flow Beneath the Reykjanes Ridge
James B. Gaherty
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.
School of Earth and Atmospheric Sciences, Georgia Institute of
Technology, Atlanta, GA 30332, USA.
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Melt Segregation and Strain Partitioning: Implications for Seismic Anisotropy and Mantle Flow.
- B. K. Holtzman, D. L. Kohlstedt, M. E. Zimmerman, F. Heidelbach, T. Hiraga, and J. Hustoft (2003)
Science
301, 1227-1230
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