Observations of Deformation

Volcano number:351080
Geodetic measurements?Yes
Deformation observation?Yes
Measurement method(s):InSAR, Levelling, Tiltmeter
Duration of observation:1989-2009 (tilt and levelling), 2006-2009 (InSAR)
Inferred cause(s) of deformation:Magmatic
Characteristics of deformation:

Tilt and levelling stations detected uplift at Galeras, starting in 1989, with peak uplift rates between June and November 1991 (Ordoñez and Rey, 1997). The source was modelled as a magmatic body, which rose from a depth of 2-3 km in late 1990 to less than 500 m in Dec. 1991.
3 cm of subsidence were detected at Galeras during an ALOS survey of Colombian volcanoes (Parks et al., 2011). The deformation occurred between Dec. 2007 and Jan. 2008, coincident with an eruption on Jan. 17 2008, and was modelled as a deflating magma body with 6.5 x 105 mvolume loss at 2 km depth. The same source was modelled by tilt to have a volume loss of ~ 7 x 10m3 at 1.4 km depth between 17 and 19 Jan. 2008 (Parks et al., 2011).

Reference(s):Ordóñez, V. M. I. G. C. A. Rey (1997), Deformation associated with the extrusion of a dome at Galeras volcano, 1990–1991,
J. Volcanol. Geotherm. Res., 77 (1997), pp. 115–120, doi:10.1016/S0377-0273(96)00090-X
Parks, M. M., J. Biggs, T. A. Mather, D. M. Pyle, F. Amelung, M. L. Monsalve, and L. Narváez Medina (2011), Co-eruptive subsidence at Galeras identified during an InSAR survey of Colombian volcanoes (2006–2009), Journal of Volcanology and Geothermal Research 202, no. 3, 228-240, doi:10.1016/j.jvolgeores.2011.02.007
Location:1.22, -77.37
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