Diverse deformation patterns of Aleutian volcanoes from satellite interferometric synthetic aperture

Interferometric synthetic aperture radar (InSAR) is capable of measuring ground-surface deformation with centimeter-to-subcentimeter precision at a spatial resolution of tens of meters over a large region. With its global coverage and all-weather imaging capability, InSAR has become an increasingly 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 processes. This paper summarizes the diverse deformation patterns of the Aleutian volcanoes observed with InSAR. These include the following: 1) infla-tion of Mount Peulik Volcano preceding a seismic swarm at nearby Becharof Lake in 1998; 2) persistent volcano-wide subsidence at Aniakchak and Fisher Volcanoes; 3) magmatic intrusion and 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 1992–93 eruption at Seguam Volcano; 6) subsidence caused by a decrease in pore fluid pressure in an active hydrothermal system beneath Kiska Volcano; and 7) lack of expected deforma-tion associated with recent eruptions at Shishaldin, Pavlof, Cleveland, and Korovin Volcanoes. We also present preliminary InSAR results for the Katmai Volcano group, and Chiginagak and Dutton Volcanoes. These studies demonstrate that deformation patterns and associated magma supply mechanisms in the Aleutians are diverse and vary between volcanoes. These findings provide an improved understanding of magmatic plumbing systems in the Aleutians. 1