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The unique radar scattering properties of silicic lava flows and domesSilicic (silica-rich) lava flows, such as rhyolite, rhyodacite, and dacite, possess unique physical properties primarily because of the relatively high viscosity of the molten lava. Silicic flows tend to be thicker than basaltic flows, and the resulting large-scale morphology is typically a steep-sided dome or flow lobe, with aspect ratios (height/length) sometimes approaching unity. The upper surfaces of silicic domes and flows are normally emplaced as relatively cool, brittle slabs that fracture as they are extruded from the central vent areas, and are then rafted away toward the flow margin as a brittle carapace above a more ductile interior layer. This mode of emplacement results in a surface with unique roughness characteristics, which can be well-characterized by multiparameter synthetic aperture radar (SAR) observations. In this paper, we examine the scattering properties of several silicic domes in the Inyo volcanic chain in the Eastern Sierra of California, using AIRSAR and TOPSAR data. Field measurements of intermediate-scale (cm to tens of m) surface topography and block size are used to assess the mechanisms of the scattering process, and to quantify the unique roughness characteristics of the flow surfaces.
Document ID
19950027390
Document Type
Conference Paper
Authors
Plaut, Jeffrey J. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Stofan, Ellen R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Anderson, Steven W. (Black Hills State Univ. Spearfish, SD., United States)
Crown, David A. (Pittsburgh Univ. Pittsburgh, PA., United States)
Date Acquired
September 6, 2013
Publication Date
January 23, 1995
Publication Information
Publication: Summaries of the Fifth Annual JPL Airborne Earth Science Workshop. Volume 3: AIRSAR Workshop
Subject Category
EARTH RESOURCES AND REMOTE SENSING
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19950027368Analytic PrimarySummaries of the Fifth Annual JPL Airborne Earth Science Workshop. Volume 2: TIMS Workshop