VP and VS structure of the Yellowstone hot spot from teleseismic tomography: Evidence for an upper mantle plume
Article first published online: 13 APR 2006
Copyright 2006 by the American Geophysical Union.
Journal of Geophysical Research: Solid Earth (1978–2012)
Volume 111, Issue B4, April 2006
How to Cite
2006), VP and VS structure of the Yellowstone hot spot from teleseismic tomography: Evidence for an upper mantle plume, J. Geophys. Res., 111, B04303, doi:10.1029/2005JB003867., , and (
- Issue published online: 13 APR 2006
- Article first published online: 13 APR 2006
- Manuscript Accepted: 28 DEC 2005
- Manuscript Revised: 2 NOV 2005
- Manuscript Received: 5 JUN 2005
 The movement of the lithosphere over a stationary mantle magmatic source, often thought to be a mantle plume, explains key features of the 16 Ma Yellowstone–Snake River Plain volcanic system. However, the seismic signature of a Yellowstone plume has remained elusive because of the lack of adequate data. We employ new teleseismic P and S wave traveltime data to develop tomographic images of the Yellowstone hot spot upper mantle. The teleseismic data were recorded with two temporary seismograph arrays deployed in a 500 km by 600 km area centered on Yellowstone. Additional data from nearby regional seismic networks were incorporated into the data set. The VP and VS models reveal a strong low-velocity anomaly from ∼50 to 200 km directly beneath the Yellowstone caldera and eastern Snake River Plain, as has been imaged in previous studies. Peak anomalies are −2.3% for VP and −5.5% for VS. A weaker, anomaly with a velocity perturbation of up to −1.0% VP and −2.5% VS continues to at least 400 km depth. This anomaly dips 30° from vertical, west-northwest to a location beneath the northern Rocky Mountains. We interpret the low-velocity body as a plume of upwelling hot, and possibly wet rock, from the mantle transition zone that promotes small-scale convection in the upper ∼200 km of the mantle and long-lived volcanism. A high-velocity anomaly, 1.2% VP and 1.9% VS, is located at ∼100 to 250 km depth southeast of Yellowstone and may represent a downwelling of colder, denser mantle material.