Observations of Deformation

Volcano number:312070
Country:United States
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR, GPS - campaign
Duration of observation:1992 - 2010
Inferred cause(s) of deformation:Magmatic
Characteristics of deformation:

Long-term average deformation rates show inflation of the volcano at ~5 mm/yr. The source of deformation is located beneath the center of the caldera at a depth of ~8 km. Source volume changes are 0.002 – 0.003 km³/yr. Deformation is thought to be magmatic in origin and caused by some combination of a) constant recharge of the system, b) growth of a segregated melt lens over time, or c) pressurisation of the system by trapped volatiles.

Reference(s):Fournier, Thomas, and Freymueller, Jeff, 2008, Inflation detected at Mount Veniaminof, Alaska, with campaign GPS: Geophysical Research Letters, v. 35, L20306, doi:10.1029/2008GL035503, 5 p.
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:56.17, -159.38
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