An InSAR-based survey of volcanic deformation in the southern Andes

Details An InSAR-based survey of volcanic deformation in the southern Andes An InSAR-based survey of volcanic deformation in the southern Andes

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3115610p&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 15, CiteID L15610

Physics

8

Geodesy And Gravity: Space Geodetic Surveys, Tectonophysics: Physics Of Magma And Magma Bodies

Scientific paper

We use Interferometric Synthetic Aperture Radar (InSAR) to search for surface deformation in the southern Andes (40°S-46°S and 49°S-53°S) associated with magmatic processes. Although the available data are not optimal, we can constrain the amount of volcanic deformation at about 27 Holocene volcanoes between the years 1993-1999. We detect inflation of Cerro Hudson volcano following its 1991 eruption, and use spherical and non-spherical models to constrain the source of deformation to be between 4 and 8 km below sea level. We measure the rate of deformation to be about 5 cm/year in the radar line-of-sight, and infer that the maximum deformation could exceed 10 cm/year in the center of the caldera. Within the errors of the measurements, the rate of deformation is constant from 1993-1998 (10-30 × 106 m3/year). At this rate, 100-200 years is required to accumulate the volume of material erupted in 1991.

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