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Keywords
InSAR
Llaima
monitoring
open volcano
phase unwrapping
Index Terms
ComputationalGeophysics: M odeling
Geodesy and Gravity:Satellite ge odesy:results
Volcanology: Rem ote
sensing of volcanoes
Abstract Cite d By (0)
GEOPHYSICAL RESEARCH LETTERS, VOL. 38, L10304, 5 PP., 2011
doi:10.1029/2011GL047168
Inflation and deflation at the steep-sided Llaimastratovolcano
(Chile) detected by using InSAR
Key Points
Magma resource beneath Llaima volcano constrained
Enhanced modeling strategy
Surface deformation monitored
H. BathkeDepartment of Physics of the Earth, Helmholtz-Centre
Potsdam, DeutschesGeoForschungsZentrum, Potsdam, Germany
M. ShirzaeiDepartment of Physics of the Earth, Helmholtz-Centre
Potsdam, DeutschesGeoForschungsZentrum, Potsdam, Germany
T. R. WalterDepartment of Physics of the Earth, Helmholtz-Centre
Potsdam, DeutschesGeoForschungsZentrum, Potsdam, Germany
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 10 m during the subsidence period,
followed by a
volume increase of 6 20 10 m 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.
Received 16 February 2011; accepted 1 April 2011; published 19
May 2011.
Citation: Bathke, H., M. Shirzaei, and T. R. Walter (2011),
Inflation and deflation at the steep-sided
Llaima stratovolcano (Chile) detected by using InSAR, Geophys.
Res. Lett., 38, L10304,
doi:10.1029/2011GL047168.
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