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- W193860695 abstract "A sudden increase in fumarolic activity at Sherman Crater near the summit of Mount Baker, Washington, occurred in March, 1975. Various estimates in the increase in heat flow range from 3 to 10 times the previous level over the roughly half a square kilometer area of the crater. Temperatures of many of the old fumaroles have increased, some by more than 30/sup 0/C and numerous new fumaroles have formed. Gravity stations were established on the crater rim in May, 1975 as well as control stations at the base of the mountain and have been resurveyed periodically since then. A maximum decrease in gravity of 0.55 mgals has been observed at the crater stations relative to base stations. Applying corrections to the gravity data to adjust for seasonal ice and snow loads results in a curve which appears to be reaching an equilibrium value about 0.35 mgals lower than the first gravity reading. This corresponds to a free air elevation increase of a little more than a meter. A model is proposed to explain this change solely by hydrothermal heating of a cylinder of radius 0.4 km extending below Sherman Crater. Deep-seated changes in the hydrothermal plumbing system allows additional heatmore » to be rapidly brought to the upper portions of the volcanoe's core heating the rock and causing thermal expansion to produce the apparent uplift. Some constraints on this model are the almost total lack of seismicity during this process and the apparent absence of tilt on the flanks of the volcano.« less" @default.
- W193860695 created "2016-06-24" @default.
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- W193860695 date "1976-12-01" @default.
- W193860695 modified "2023-09-22" @default.
- W193860695 title "Deformation of Mount Baker volcano by hydrothermal heating" @default.
- W193860695 hasPublicationYear "1976" @default.
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