Yellowstone: Seismic Evidence for a Chemical Mantle Plume

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Science  24 Sep 1976:
Vol. 193, Issue 4259, pp. 1237-1239
DOI: 10.1126/science.193.4259.1237


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.