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Reevaluating Volcanic Deformation Using Atmospheric Corrections: Implications for the Magmatic System of Agung Volcano, Indonesia

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)13704-13711
Number of pages8
JournalGeophysical Research Letters
Volume46
Issue number23
Early online date27 Nov 2019
DOIs
DateAccepted/In press - 17 Nov 2019
DateE-pub ahead of print - 27 Nov 2019
DatePublished (current) - 16 Dec 2019

Abstract

A major challenge in using satellite interferometry (InSAR) for volcanic monitoring in the tropics is distinguishing volcano deformation from atmospheric noise. We reanalysed InSAR 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 (ECMWF-HRES). 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.

    Research areas

  • atmospheric correction, InSAR, volcano deformation, tropical volcano, atmospheric artifacts

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via American Geophysical Union (AGU) at https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GL085233 . Please refer to any applicable terms of use of the publisher.

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