[SSS16-P11] Recent crustal deformations around Mt. Azuma revealed by InSAR time-series analysis
Keywords:InSAR, Time-series analysis, Mt. Azuma
In this paper, we identify the crustal deformations associated with these volcanic activities using InSAR time series analysis, determine source locations and change in intensities, and discuss the relation between the time evolution of the sources and observed volcanic activities.
For that purpose, we first analyzed ALOS-2 data (from 2015 to 2018; 8 data) with time series analysis. From the analysis, we identified a pattern of wide crustal deformations over Mt. Azuma. The pattern remains same through time but changes its sign. Deformations corresponding to inflation were observed in 2014-2015, then those corresponding to deflation were observed in 2015-2017, and again those corresponding to inflation were observed in 2018. All these deformations seem to be associated with the spherical pressure source located 3km below sea level (GSI, 2015).
Then we analyzed Sentinel-1 data (from 2018.3 to 2018.11, 21 data) with time series analysis. From the analysis, we identified deformations corresponding to inflation that are localized around the O-ana crater. The deformation rate remains same till September but increased after October.
In this research we re-estimate the source locations/intensities associated with wide/localized deformations, and discuss the relations between time-evolution of those sources and observed volcanic activities.
ALOS-2 data were provided from the Volcano Working Group under a cooperative research contract with JAXA (Japan Aerospace Exploration Agency). The ownership of ALOS-2 data belongs to JAXA.