NDLI: Estimating lava volume by precision combination of multiple baseline spaceborne and airborne interferometric synthetic aperture radar: the 1997 eruption of Okmok volcano, Alaska

Content Provider	IEEE Xplore Digital Library
Author	Zhong Lu Eric Fielding Patrick, M.R. Trautwein, C.M.
Copyright Year	1980
Abstract	Interferometric synthetic aperture radar (InSAR) techniques are used to calculate the volume of extrusion at Okmok volcano, Alaska by constructing precise digital elevation models (DEMs) that represent volcano topography before and after the 1997 eruption. The posteruption DEM is generated using airborne topographic synthetic aperture radar (TOPSAR) data where a three-dimensional affine transformation is used to account for the misalignments between different DEM patches. The preeruption DEM is produced using repeat-pass European Remote Sensing satellite data; multiple interferograms are combined to reduce errors due to atmospheric variations, and deformation rates are estimated independently and removed from the interferograms used for DEM generation. The extrusive flow volume associated with the 1997 eruption of Okmok volcano is 0.154/spl plusmn/0.025 km/sup 3/. The thickest portion is approximately 50 m, although field measurements of the flow margin's height do not exceed 20 m. The in situ measurements at lava edges are not representative of the total thickness, and precise DEM data are absolutely essential to calculate eruption volume based on lava thickness estimations. This study is an example that demonstrates how InSAR will play a significant role in studying volcanoes in remote areas.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	1428
Ending Page	1436
Page Count	9
File Size	1175177
File Format	PDF
ISSN	01962892
Volume Number	41
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spaceborne radar Synthetic aperture radar interferometry Volcanoes Thickness measurement Digital elevation models Surfaces Remote sensing Satellites Atmospheric measurements Fluid flow measurement
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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Estimating Lava Volume by Precision Combination of Multiple Baseline Spaceborne and Airborne Interferometric Synthetic Aperture Radar: the 1997 Eruption of Okmok Volcano

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