Emmons Lake

Observations of Deformation

Volcano number:312020
Region:
Country:United States
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:2003 - 2009
Inferred cause(s) 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(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
http://www.avo.alaska.edu/volcanoes/volcinfo.php?volcname=Emmons+Lake+Volcanic+Center
Location:55.341, -162.073
REST API endpoint (JSON):https://comet.nerc.ac.uk/wp-json/volcanodb/v1/volcano/871