Statistics – Computation
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3810304b&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 10, CiteID L10304
Statistics
Computation
2
Computational Geophysics: Modeling (1952, 4255, 4316), Geodesy And Gravity: Satellite Geodesy: Results (6929, 7215, 7230, 7240), Volcanology: Remote Sensing Of Volcanoes (4337)
Scientific paper
Llaima volcano, Chile, is a typical basaltic-to-andesitic stratovolcano in the southcentral Andes. Llaima had at least four explosive eruptions in the decade 2000 - 2010, however little is known about the physical processes and magma storage at this volcano. In this study we present an InSAR deformation field at Llaima from 2003 - 2008, covering both the post-eruptive and syn-eruptive periods. The satellite InSAR data are significantly affected by environmental decorrelation due to steep topography, snow and vegetation; because of this, we applied a model-assisted phase unwrapping approach. The analysis of these data suggests two main deformation episodes: subsidence associated with the post-eruptive period, and uplift associated with the syn-eruptive period. Maximum summit subsidence and uplift are ˜10 cm and ˜8 cm, respectively. Through inverse modeling of both periods, a deflating and inflating magma body can be inferred, located at a depth of 4 - 12 km, subject to a volume decrease of 10 - 46 × 106 m3 during the subsidence period, followed by a volume increase of 6 - 20 × 106 m3 during the uplift period. Therefore, this study presents the first evidence of magma-driven deformation at Llaima volcano, and suggests that eruption periods are associated with the inflation and deflation of a deep magma body that can be monitored by using space geodesy.
Bathke H.
Shirzaei M.
Walter Thomas R.
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