Semisopochnoi

Volcano number:311060
Region:Alaska
Country:United States
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:2004 - 2010
Inferred cause of deformation:Surface deposits, Uncertain
Characteristics of deformation:

Semisopochnoi island, encompassing Mount Cerebus, subsided suring th period 2004 – 2010. Maximum rates of ~1 cm/yr are observed at Mount Cerebus, with the rest of the island subsiding at lesser rates. Downward motion is thought to include a component of horizontal motion. Deformation is though to reflect thermoelastic contraction of lava flows, mechanical compaction and gravitational sliding.

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
http://www.avo.alaska.edu/volcanoes/volcinfo.php?volcname=Semisopochnoi
Location:179.58, 51.93

Aerial view of Semisopochnoi island. Source R. Clifford, U.S. Geological Survey AVO website