On the relationship between Very-Long-Period events, bubble collapse, and eruption processes at the Lone Star Geyser, Yellowstone National Park
Abstract
Broadband seismic data acquired at the Lone Star Geyser in Yellowstone National Park over a 5-day period in September, 2010 contain Very-Long-Period (VLP) events (~2 min period) and impulsive bubble collapse events (0.25 sec duration) that are correlated with eruption/discharge cycles. Geyser 'jet' eruptions at Lone Star are fairly regular at ~3 hour (180 min) intervals, but the VLP events typically occur at ~22.5 min intervals, which is effectively a 3rd order harmonic of the jet eruption fundamental period. Bubble collapse events are impulsive with nearly monochromatic frequencies of 20-25 Hz, and the rate of these events is correlated with the VLP event cycle. These results suggest a 2-stage process model for the Lone Star eruptions, where the deep/main reservoir discharges a slug of hot water into a shallow 'chimney' every ~22.5 min, which triggers boiling and bubble collapse events as it rises and decompresses in the chimney.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2011
- Bibcode:
- 2011AGUFM.V51G..06S
- Keywords:
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- 8424 VOLCANOLOGY / Hydrothermal systems