Volcano number:311190
Country:United States
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:1993 - 2000, 2004 - 2009
Inferred cause of deformation:Magmatic, Surface deposits
Characteristics of deformation:

Interferograms covering the volcano show two regions of subsidence. The first is location on the southeastern flank of the volcano with deformation occuring at rates of ~0.5 cm/yr. This deformation is modelled by a point source at <1 km depth and is thought to originate from cooling and degassing of magma intruded during eruptions in 1987 and 1996.  A second region of subsidence at rates of ~1 mm/yr is seen on the lower southwestern flank. This is in a region of lava flows thought to originate from the 1963 eruption, and subsidence is therefore attributed to thermoelastic constraction of lava flows.

Reference:Lu, Z., and Dzurisin, D., 2014, InSAR imaging of Aleutian volcanoes: Chichester, UK, Springer-Praxis, 390 p.
Reference:U.S. Geological Survey Alaska Volcano Observatory (AVO) website
Location:-171.252, 52.5

Photo of Amukta. Source U.S. Fish and Wildlife Service, U.S. Geological Survey AVO website