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Record Details

Record 9 of 306
On the relationship between age of lava flows and radar backscattering
Author and Affiliation:
Blom, R. G.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Cooley, P.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Schenck, L. R.(Jet Propulsion Lab., California Inst. of Tech., Pasadena, CA, United States)
Abstract: The observation that older lava flows have lower backscatter in radar images is assessed with multiwavelength/polarization scatterometer data with incidence angles from 15 to 50 deg. Backscatter decreases over time because surface roughness decreases due to infilling with dust and mechanical weathering of the rocks. Pahoehoe lavas in the Snake River Plain with ages of 2.1, 7,4, and 12.0 K yr are best separated with 2.25 cm wavelength data. Blocky obsidian flows at Medicine Lake Highland and Newberry Volcano with ages of 0.9, 1.1 and 1.4 K yr are best separated with 6.3 cm wavelength data. Two Pleistocene flows at the Snake River Plain are best separated with 19.0 cm wavelength data. Incidence angles from 20 to 35 deg are best. These data indicate it may be possible to separate lava flows into eruptive periods using calibrated multiwavelength radar backscatter data.
Publication Date: Aug 01, 1986
Document ID:
19870007915
(Acquired Nov 04, 1995)
Accession Number: 87N17348
Subject Category: COMMUNICATIONS AND RADAR
Document Type: Conference Paper
Publication Information: ESA Proceedings of the 1986 International Geoscience and Remote Sensing Symposium (IGARSS '86) on Remote Sensing: Today's Solutions for Tomorrow's Information Needs, Volume 2; p 1119-1127
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 9p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution within the U.S. granted by agreement
NASA Terms: BACKSCATTERING; GEOCHRONOLOGY; LAVA; RADAR SCATTERING; VOLCANOLOGY; RADAR IMAGERY; SCATTEROMETERS; SURFACE ROUGHNESS EFFECTS
Imprint And Other Notes: In ESA Proceedings of the 1986 International Geoscience and Remote Sensing Symposium (IGARSS '86) on Remote Sensing: Today's Solutions for Tomorrow's Information Needs, Volume 2 p 1119-1127 (SEE N87-17283 09-43)
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