VP AND VS STRUCTURE OF THE YELLOWSTONE HOT SPOT FROM TELESEISMIC TOMOGRAPHY: EVIDENCE FOR AN UPPER MANTLE PLUME
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dc.contributor.author | Waite G.P. | |
dc.contributor.author | Smith R.B. | |
dc.contributor.author | Allen R.M. | |
dc.date.accessioned | 2025-02-01T10:39:35Z | |
dc.date.available | 2025-02-01T10:39:35Z | |
dc.date.issued | 2006 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=41838283 | |
dc.identifier.citation | Journal of Geophysical Research: Solid Earth, 2006, 111, 4, B04303 | |
dc.identifier.issn | 2169-9356 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/47648 | |
dc.description.abstract | 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. Copyright 2006 by the American Geophysical Union. | |
dc.title | VP AND VS STRUCTURE OF THE YELLOWSTONE HOT SPOT FROM TELESEISMIC TOMOGRAPHY: EVIDENCE FOR AN UPPER MANTLE PLUME | |
dc.type | Статья | |
dc.identifier.doi | 10.1029/2005JB003867 |
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