Observations of Deformation

Volcano number:313040
Country:United States
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR
Duration of observation:1993 - 2010
Inferred cause(s) of deformation:Magmatic
Characteristics of deformation:

InSAR measurements at Spurr cover two seismic swarms. The first swarm took place in 1996 – 1998 at Strandline Lake, 30 km northeast of Spurr. Initial InSAR observations showed no evidence of strong surface deformation, ruling out magma intrusion at depths <10 km (Kilgore et al., 2011). Later observations by Lu and Dzurisin (2014) identify broad inflation associated with this event, and find that best-fitting models agree with a deep source (12-16 km). InSAR measurements covering a second earthquake swarm in 2004 – 2005 beneath the summit of Spurr also show broad inflation at 10 – 14 km depth. Modelled volume changes associated with both events are similar (0.04 – 0.06 km³), and are interpreted to be caused by episodic intrusion of magma into the crust. InSAR measurements outside of these periods show no evidence of deformation.

Reference(s):Kilgore, W.W., Roman, D.C., Biggs, Juliet, and Hansen, Roger, 2011, Seismic and geodetic investigation of the 1996-1998 earthquake swarm at Strandline Lake, Alaska: Geophysical Journal International, v. 186, n. 3, p. 1365-1379, doi:10.1111/j.1365-246X.2011.05115.x.
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:61.299, -152.251
REST API endpoint (JSON):https://comet.nerc.ac.uk/wp-json/volcanodb/v1/volcano/5201

Latest Sentinel-1 Data

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