Vp/Vs ratios in the Yellowstone National Park region, Wyoming
Journal of Volcanology and Geothermal Research
By: S.N. Chatterjee, A.D. Pitt, and H. M. Iyer
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Abstract
In this paper we study the variation of Vp/Vs and Poisson's ratio (??) in the Yellowstone National Park region, using earthquakes which were well recorded by a local seismic network. We find that the average Vp/Vs value within the geothermally active Yellowstone caldera is about 7% lower than in the area outside the caldera. Within the caldera itself there may be a further 2-7% reduction of Vp/Vs in the hydrothermally active Norris Geyser Basin, the Upper and Lower Geyser Basins, and the Yellowstone Lake and Mud Volcano regions. After considering various possible causes for Vp/Vs changes, such as geologic and structural differences, thermal effects, partial melting, and hydrothermal activity, we conclude that the most plausible explanation for the observed Vp/Vs reduction is the presence of hot-water at temperatures and pore-pressures near the water steam transition in the caldera geothermal reservoirs. ?? 1985.
Suggested Citation
Chatterjee, S., Pitt, A., Iyer, H., 1985, Vp/Vs ratios in the Yellowstone National Park region, Wyoming: Journal of Volcanology and Geothermal Research, v. 26, no. 3-4, p. 213-230.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Vp/Vs ratios in the Yellowstone National Park region, Wyoming |
| Series title | Journal of Volcanology and Geothermal Research |
| Volume | 26 |
| Issue | 3-4 |
| Year Published | 1985 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Volcanology and Geothermal Research |
| First page | 213 |
| Last page | 230 |