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Radar imaging of glaciovolcanic stratigraphy, Mount Wrangell caldera, Alaska - Interpretation model and resultsGlaciological measurements and an airborne radar sounding survey of the glacier lying in Mount Wrangell caldera raise many questions concerning the glacier thermal regime and volcanic history of Mount Wrangell. An interpretation model has been developed that allows the depth variation of temperature, heat flux, pressure, density, ice velocity, depositional age, and thermal and dielectric properties to be calculated. Some predictions of the interpretation model are that the basal ice melting rate is 0.64 m/yr and the volcanic heat flux is 7.0 W/sq m. By using the interpretation model to calculate two-way travel time and propagation losses, radar sounding traces can be transformed to give estimates of the variation of power reflection coefficient as a function of depth and depositional age. Prominent internal reflecting zones are located at depths of approximately 59-91m, 150m, 203m, and 230m. These internal reflectors are attributed to buried horizons of acidic ice, possibly intermixed with volcanic ash, that were deposited during past eruptions of Mount Wrangell.
Document ID
19890056766
Document Type
Reprint (Version printed in journal)
Authors
Clarke, Garry K. C. (British Columbia Univ. Vancouver British Columbia, Canada)
Cross, Guy M. (British Columbia, University Vancouver, Canada)
Benson, Carl S. (Alaska, University Fairbanks, United States)
Date Acquired
August 14, 2013
Publication Date
June 10, 1989
Publication Information
Publication: Journal of Geophysical Research
Volume: 94
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG9-9
CONTRACT_GRANT: NSF EAR-75-21506
CONTRACT_GRANT: NSF EAR-77-15166
Distribution Limits
Public
Copyright
Other