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Reevaluating Volcanic Deformation Using Atmospheric Corrections: Implications for the Magmatic System of Agung Volcano, Indonesia
Author(s) -
Yip Stanley Tze Hou,
Biggs Juliet,
Albino Fabien
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl085233
Subject(s) - volcano , geology , interferometric synthetic aperture radar , unrest , magma , seismology , interferometry , atmospheric noise , deformation (meteorology) , synthetic aperture radar , radar , meteorology , infrasound , remote sensing , optics , physics , telecommunications , oceanography , politics , political science , acoustics , computer science , law
A major challenge in using satellite interferometry (interferometric synthetic aperture radar) for volcanic monitoring in the tropics is distinguishing volcano deformation from atmospheric noise. We reanalyzed interferometric synthetic aperture radar time series from 2007–2009 from Agung volcano, Indonesia, which had previously been used as evidence for unrest. Using uncorrected data, we find an apparent velocity of 5.0±2.7 cm/yr consistent with previous reports, but we show that this signal is consistent with predictions of atmospheric contributions derived from weather models (European Centre for Medium‐Range Weather Forecasts‐High‐Resolution). Following the correction, we find a velocity of 1.4±4.2 cm/yr and conclude that there was no significant deformation related to the inflation of a shallow magma source from 2007–2009. We discuss the implications for the inferred magma storage system at Agung and consider which other reported signals might have been wrongly attributed to deformation and should be reanalyzed.