Volcano number:313020
Country:United States
Geodetic measurements?Yes
Deformation observation?No
Measurement method(s):InSAR
Duration of observation:1995 - 2010
Inferred cause of deformation:Magmatic
Characteristics of deformation:

Between 1995 – 2000, interferograms show a deformation signal near Iliamna, much of which seems to have occurred during 1996–1997 when a seismic swarm was recorded at the volcano. This seismic swarm has been attributed to a possible dike intrusion. Modelling the InSAR observations for a  rectangular dike source yields a best-fit model that is a NW–SE-striking subvertical dike 7 9 8 km in dimension and centered at ~8 km depth. After this time interferograms show no evidence of deformation.

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:-153.09, 60.032

Photo of Iliamna. Source: D. Anderson, U.S. Geological Survey AVO website