Abstract :
[en] Synthetic Aperture Radar (SAR) Differential Interferometry (DInSAR) and its extensions to manage time series
are nowadays well-known and mastered techniques to perform among others land-motion monitoring.
We present here a fully automated monitoring service based on DInSAR and Multidimensional Small Baseline
Subset (MSBAS) methods. The automated processing chain named “InSAR automated Mass processing
Toolbox for multidimensional Time series” (MasTer) is demonstrated with the peculiar case of the Laguna del
Maule and Domuyo volcanoes, which are known to undergo significant inflation up to several cm or tens of cm
per year.
The here-described monitoring service is made of three components: an InSAR command line processor, the
MSBAS processor and a number of shell scripts automatizing all tasks, from data downloading to updated
displacement maps and time series. Thanks to the European Commission Copernicus Service, data are freely
available every 12 or 6 days along each orbit, depending on ESA acquisition plan. Linear deformation rate maps
and time series of vertical and East-West ground deformation computed by the MasTer tool are updated every
1–6 days on a web page, according to the S1 data availability. Interested user can request additional time series
at coherent pixels that wouldn’t be displayed on the web page and receive them by e-mail within a minute.
Processing chain and preliminary observations at Domuyo and Laguna del Maule test site are presented and
commented. The nearly 6 years long 2D time series of ground deformation allow highlighting recent changes in
the well-known deformation at both volcanoes: Domuyo inflation stabilizes since beginning of 2019 while
deformation at Laguna del Maule seems to gently accelerate since mid 2018. New deformation features are also
identified, such as a 2 km wide 3 cm/yr circular subsidence at Laguna del Maule as well as a 2 cm/yr downward
and 1 cm/yr eastward movement located to the East of Laguna Fea.
d'Oreye, Nicolas; European Centre of Geodynamics and Seismology
Jaspard, Maxime; European Centre of Geodynamics and Seismology
Caselli, Alberto; Laboratorio de Estudio y Seguimiento de Volcanes Activos (LESVA), IIPG - Universidad Nacional de Rio Negro – CONICET
Samsonov, Sergey; Canada Centre for Mapping and Earth Observation, Natural Resources Canada (NRCAN)
Scopus citations®
without self-citations
9