Emmons Lake

Volcano number:312020
Country:United States
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
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
Location:-162.073, 55.341

Photo looking NE to Emmons Lake. Source R. Hazen, U.S. Geological Survey AVO website