|Duration of observation:||2003 - 2009|
|Inferred cause of deformation:||Hydrothermal, Magmatic, Uncertain|
|Characteristics of deformation:|
Interferograms reveal subsidence within Emmons Lake caldera extending NE to Mount Hague. Maximum subsidence is measured to be ~8 mm/yr. Deformation is modelled using a sill source to replicate the elongte shape of the deformation field. The best fitting sill is ~4 km x ~1 km, striking NE and located at 7 km depth. Subsidence is attributed to cooling and volume loss from a magma body and/or depressurisation of the hydrothermal system.
|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|
Photo looking NE to Emmons Lake. Source R. Hazen, U.S. Geological Survey AVO website