HR: 11:05h
AN: G52A-04    [Abstracts]
TI: InSAR Imaging of Volcanic Deformation Over Aleutian Islands
AU: * Lu, Z
EM: lu@usgs.gov
AF: SAIC, USGS EROS, 47914 252 Street, Sioux Falls, SD 57198 United States
AU: Dzurisin, D
EM: dzurisin@usgs.gov
AF: USGS, Cascades Volcano Observatory, 1300 S.E. Cardinal Court, Suite 100, Vancouver, WA 98683 United States
AU: Wicks, C
EM: cwicks@usgs.gov
AF: USGS, Earthquake & Volcano Hazards Programs, 345 Middlefield Rd., Menlo Park, CA 94025 United States
AU: Power, J
EM: jpower@usgs.gov
AF: USGS, Alaska Volcano Observatory, 4200 University Drive, Anchorage, AK 99508 United States
AU: Kwoun, O
EM: okwoun@usgs.gov
AF: SAIC, USGS EROS, 47914 252 Street, Sioux Falls, SD 57198 United States
AU: Rykhus, R
EM: rykhus@usgs.gov
AF: SAIC, USGS EROS, 47914 252 Street, Sioux Falls, SD 57198 United States
AB: Interferometric synthetic aperture radar (InSAR) is capable of measuring ground-surface deformation with centimeter to subcentimeter precision and spatial resolution of tens-of-meters over relatively large regions under all weather conditions. The spatial distribution of surface deformation data, derived from InSAR images, enables the exploration of detailed mechanical models to enhance the study of volcanic and tectonic processes. This paper summarizes our InSAR studies of more than a dozen Alaskan volcanoes, associated with both eruptive and non-eruptive activity. These examples include the pre-eruption inflation, co-eruption deflation, and post-eruption inflation at Okmok Volcano; magmatic intrusion and the associated tectonic stress release at Akutan Volcano; progressive aseismic inflation of Westdahl Volcano; magmatic intrusion at Mount Peulik Volcano and its relation to an earthquake swarm 30 km away; magmatic intrusion associated with a small eruption at Makushin Volcano in 1995; complex patterns of transient deformation during and after the 1992-1993 eruption at Seguam Volcano; surface subsidence caused by a decrease in pore fluid pressure in an active hydrothermal system beneath Kiska Volcano; compaction of young pyroclastic flow deposits at Augustine Volcano; persistent volcano-wide subsidence at Aniakchak Volcano; and lack of expected deformation associated with recent eruptions at Shishaldin, Pavlof, Cleveland, and Korovin Volcanoes. We conclude that the deformation patterns and the associated magma supply mechanisms over Aleutian Volcanoes are diverse and vary between volcanoes. These studies demonstrate that InSAR can improve our understanding on how the Aleutian Volcanoes work and enhance our capability to predict future eruptions and associated hazards.
UR: http://edc.usgs.gov/Geo_Apps/
DE: 6924 Interferometry (1207, 1209, 1242)
DE: 8419 Volcano monitoring (7280)
DE: 8485 Remote sensing of volcanoes
DE: 8488 Volcanic hazards and risks
SC: Geodesy [G]
MN: Fall Meeting 2005