HR: 16:00h
AN: V34A-03    [Abstracts]
TI: Diverse deformation patterns of Aleutian stratovolcanoes from InSAR imaging
AU: * Lu, Z
EM: lu@usgs.gov
AF: SAIC, USGS National Center, EROS, 47914 252nd 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 with a spatial resolution of tens-of-meters over a relatively large region. With its global coverage and all-weather imaging capability, InSAR is an important measurement technique for constraining magma dynamics of volcanoes over remote regions such as the Aleutian Islands. The spatial distribution of surface deformation data, derived from InSAR images, enables the construction of detailed mechanical models to enhance the study of magmatic and tectonic processes. This paper highlights the results from the InSAR-based survey of ground surface deformation of stratovolcanoes in the Aleutian. These results include: 1) inflation of Mount Peulik volcano preceding a seismic swarm that occurred in 1998; 2) persistent volcano-wide subsidence at Aniakchak volcano; 3) magmatic intrusion and the associated tectonic stress release at Akutan volcano; 4) magmatic intrusion at Makushin volcano associated with a small eruption in 1995; 5) complex patterns of transient deformation during and after the 1992-1993 eruption at Seguam volcano; 6) surface subsidence caused by decrease in pore fluid pressure in an active hydrothermal system beneath Kiska volcano; and 7) a lack of expected deformation associated with recent eruptions at Shishaldin, Pavlof, Cleveland and Korovin volcanoes. These studies demonstrate that the deformation patterns and the associated magma supply mechanisms over stratovolcanoes in the Aleutian are diverse and vary between volcanoes, and therefore have significant implications for future volcano monitoring effort.
UR: http://edc.usgs.gov/Geo_Apps/
DE: 1243 Space geodetic surveys
DE: 6924 Interferometry
DE: 8414 Eruption mechanisms
DE: 8419 Eruption monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2005 Joint Assembly