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Journal Article

Yellowstone: Seismic Evidence for a Chemical Mantle Plume

David M. Hadley, Gordon S. Stewart and John E. Ebel
Science
New Series, Vol. 193, No. 4259 (Sep. 24, 1976), pp. 1237-1239
Stable URL: http://www.jstor.org/stable/1742394
Page Count: 3

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Topics: Plumes, Velocity, Travel time, Mantle, P waves, Chemicals, Calderas, Diameters, Cooling towers, Azimuth
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Yellowstone: Seismic Evidence for a Chemical Mantle Plume
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Abstract

Arrivals of P waves from a recent event at the Nevada Test Site, recorded at a distance of 15.3°, passed beneath the Yellowstone caldera at depths of 200 and 400 kilometers. The travel time anomalies are modeled by a vertical cylindrical structure with a high-velocity core and a low-velocity collar as compared with the more normal mantle. The velocity structure and vertical extent of this feature are consistent with a chemical mantle plume beneath the Yellowstone caldera.

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