Observations of Deformation

Volcano number:313020
Country:United States
Geodetic measurements?Yes
Deformation observation?No
Measurement method(s):InSAR
Duration of observation:1995 - 2010
Inferred cause(s) 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(s):Lu, Z., and Dzurisin, D., 2014, InSAR imaging of Aleutian volcanoes: Chichester, UK, Springer-Praxis, 390 p.
U.S. Geological Survey Alaska Volcano Observatory (AVO) website
Location:60.032, -153.09
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Latest Sentinel-1 Data

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