Gas analyses of fumaroles from Mt. Hood, Oregon
Technical Report
·
OSTI ID:5047202
The eruptive activity of Mt. St. Helens beginning in March 1980, coupled with earthquake activity on Mt. Hood in early July, has generated increased interest in the fumaroles near the summit of Mt. Hood. These fumaroles are associated with Crater Rock, a hornblende dacite plug, extruded 200 to 300 years ago (Crandell, 1980). A major eruption in about 1700 and lesser eruptions in 1805, 1859, and 1865 (Harris, 1976) were centered near Crater Rock. It is likely that future eruptions will occur in this area. Changes in the surficial characteristics of the fumaroles or changes in the composition of the gas emitted by the fumaroles could precede an eruption by a sufficient length of time to help predict the eruption. In 1935, K.N. Phillips and G.R. Collins collected and analyzed the first samples of gases from the fumaroles (Phillips, 1936). F.D. Ayres and A.E. Creswell (1951) collected and analyzed gas samples from orifices they considered to be equivalent to those sampled by Phillips and Collins, and these (or orifices in the same area) were re-sampled in 1977 and 1978. The results of the 1978 sampling are presented.
- Research Organization:
- Geological Survey, Menlo Park, CA (USA); Lawrence Berkeley Lab., CA (USA)
- OSTI ID:
- 5047202
- Report Number(s):
- USGS-OFR-81-236; ON: DE82906055
- Country of Publication:
- United States
- Language:
- English
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