Acknowledgements
ERS-1 SAR images are copyright n1991 ESA, and
provided by the Alaska Satellite Facility (ASF). This
research was supported by funding from NASA (NRA-99-
OES-10 RADARSAT-0025-0056), and in part by the USGS
contract O3CRCN0001. We thank ASF for providing SAR
data on a timely basis. We thank Game McGimsey and Tina
Neal from the Alaska Volcano Observatory for sharing their
insights regarding the Westdahl lava flows, and J. Groves
for preparing the SRTM data. We are grateful for the
detailed edits and comments by D. Dzurisin. We thank M.
Poland, G. McGimsey, and two anonymous reviewers for
providing constructive technical reviews of the manuscript.