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InSAR Studies of Alaska Volcanoes

Zhong Lu(1) and Tim Masterlark(2)

(1) USGS EROS Data Center, 47914 252 Street, Sioux Falls, United States
(2) USGS/EROS Data Center, SAIC, 47914 252nd Street, Sioux Falls, SD 57198, United States

Abstract

Interferometric synthetic aperture radar (InSAR) imaging is a recently developed remote sensing technique capable of measuring ground-surface deformation with centimeter to subcentimeter precision and spatial resolution of tens-of-meters over a relatively large region (~104 km2). 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 summarizes our recent InSAR studies of 13 Alaska 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 at Makushin volcano associated with a small eruption in 1995; complex patterns of transient deformation during and after the 1992- 1993 eruption at Seguam volcano; uplift from 1993 to 1995 at New Trident volcano; surface subsidence caused by decrease in pore fluid pressure in an active hydrothermal system beneath Kiska volcano; compaction of young pyroclastic flow deposits at Augustine volcano; and a lack of expected deformation associated with recent eruptions at Shishaldin, Pavlof, Cleveland and Korovin 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 the associated hazards.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry