Structural and heat flow implications of infrared anomalies at Mt. Hood, Oregon, 1972--1977

Journal Article · Sat Apr 10 04:00:00 EST 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB087iB04p02793· OSTI ID:7042252

Friedman, J D; Williams, D L; Frank, D

Surface thermal features occupied an area of approximately 9700 m/sup 2/ at Mt. Hood in April 1973 and 9200 m/sup 2/ in September 1977, as determined by aerial infrared line scan surveys. The distribution of thermal anomalies below the summit of Mt. Hood suggests structural control by a fracture system and a brecciated zone peripheral to a young hornblende-dacite plug dome and by a concentric fracture system associated with the development of the present crater. We estimate a heat discharge of 5 to 10 MW from the extent and temperature of the thermal areas, including a heat loss of 2--4 MW via conduction, diffusion, evaporation, and radiation to the atmosphere, and a somewhat less certain loss of 3--6 MW via fumarolic mass transfer and surface advection. Additional heat is transferred to groundwater. The first part of the estimate is based on two-point models for different radiant exitance and differential geothermal flux from heat balance of the ground surface and on a shallow temperature probe traverse across the Devils Kitchen fumarole field. Alternate methods for estimating volcanogenic flux that assume a quasi steady state heat flow yield values in the 5- to 12-MW range. The estimated heat loss due to cooling of the 220 +- 150 year old dacite plug dome is insufficient to account for the heat flux at the fumarole field. The heat source is judged to be deep seated.

• Research Organization: U.S. Geological Survey, Denver, Colorado 80225
• OSTI ID: 7042252
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 87:B4; ISSN JGREA
• Country of Publication: United States
• Language: English

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