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Title: Structural and heat-flow implications of infrared anomalies at Mt. Hood, Oregon

Abstract

Surface thermal features occur in an area of 9700 m/sup 2/ at Mt. Hood, on the basis of an aerial line-scan survey made April 26, 1973. The distribution of the thermal areas below the summit of Mt. Hood, shown on planimetrically corrected maps at 1 : 12,000, suggests structural control by a fracture system and brecciated zone peripheral to a hornblende-dacite plug dome (Crater Rock), and by a concentric fracture system that may have been associated with development of the present crater. The extent and inferred temperature of the thermal areas permits a preliminary estimate of a heat discharge of 10 megawatts, by analogy with similar fumarole and thermal fields of Mt. Baker, Washington. This figure includes a heat loss of 4 megawatts (MW) via conduction, diffusion, evaporation, and radiation to the atmosphere, and a somewhat less certain loss of 6 MW via fumarolic mass transfer of vapor and advective heat loss from runoff and ice melt. The first part of the estimate is based on two-point models for differential radiant exitance and differential flux via conduction, diffusion, evaporation, and radiation from heat balance of the ground surface. Alternate methods for estimating volcanogenic geothermal flux that assume a quasi-steady statemore » heat flow also yield estimates in the 5-11 MW range. Heat loss equivalent to cooling of the dacite plug dome is judged to be insufficient to account for the heat flux at the fumarole fields.« less

Authors:
;
Publication Date:
Research Org.:
Geological Survey, Denver, CO (USA); Geological Survey, Seattle, WA (USA)
OSTI Identifier:
6789284
Report Number(s):
USGS-OFR-77-599
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; FUMAROLES; HEAT FLUX; OREGON; VOLCANOES; INFRARED SURVEYS; AERIAL SURVEYING; COOLING; DISTRIBUTION; FRACTURES; GEOLOGIC STRUCTURES; HEAT FLOW; HEAT LOSSES; MASS TRANSFER; THERMAL CONDUCTIVITY; ENERGY LOSSES; FAILURES; GEOPHYSICAL SURVEYS; LOSSES; NORTH AMERICA; PACIFIC NORTHWEST REGION; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; USA; Geothermal Legacy; 150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys

Citation Formats

Friedman, J D, and Frank, D. Structural and heat-flow implications of infrared anomalies at Mt. Hood, Oregon. United States: N. p., 1977. Web. doi:10.2172/6789284.
Friedman, J D, & Frank, D. Structural and heat-flow implications of infrared anomalies at Mt. Hood, Oregon. United States. doi:10.2172/6789284.
Friedman, J D, and Frank, D. Sat . "Structural and heat-flow implications of infrared anomalies at Mt. Hood, Oregon". United States. doi:10.2172/6789284. https://www.osti.gov/servlets/purl/6789284.
@article{osti_6789284,
title = {Structural and heat-flow implications of infrared anomalies at Mt. Hood, Oregon},
author = {Friedman, J D and Frank, D},
abstractNote = {Surface thermal features occur in an area of 9700 m/sup 2/ at Mt. Hood, on the basis of an aerial line-scan survey made April 26, 1973. The distribution of the thermal areas below the summit of Mt. Hood, shown on planimetrically corrected maps at 1 : 12,000, suggests structural control by a fracture system and brecciated zone peripheral to a hornblende-dacite plug dome (Crater Rock), and by a concentric fracture system that may have been associated with development of the present crater. The extent and inferred temperature of the thermal areas permits a preliminary estimate of a heat discharge of 10 megawatts, by analogy with similar fumarole and thermal fields of Mt. Baker, Washington. This figure includes a heat loss of 4 megawatts (MW) via conduction, diffusion, evaporation, and radiation to the atmosphere, and a somewhat less certain loss of 6 MW via fumarolic mass transfer of vapor and advective heat loss from runoff and ice melt. The first part of the estimate is based on two-point models for differential radiant exitance and differential flux via conduction, diffusion, evaporation, and radiation from heat balance of the ground surface. Alternate methods for estimating volcanogenic geothermal flux that assume a quasi-steady state heat flow also yield estimates in the 5-11 MW range. Heat loss equivalent to cooling of the dacite plug dome is judged to be insufficient to account for the heat flux at the fumarole fields.},
doi = {10.2172/6789284},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {1}
}