Axial Inflation: Past, Present & Future
Time-series of vertical deformation measurements at the center of Axial caldera, including BPR (Bottom Pressure Recorder) data during the 1998 (red) and 2011 (blue) eruptions, and since 2011 (green), and MPR (Mobile Pressure Recorder) measurements (purple dots). Note data gap between 1998-2000, meaning the relative y-axis position of the data before and after 2000 is unknown; this is just one possible depiction made so that the 1998 and 2011 eruptions started at the same level of inflation. The red dot is based on the MBARI AUV re-survey data collected in August 2014 (Dave Caress, Pers. Comm). The rate of reinflation since the 2011 eruption is about 4 times the rate observed before the eruption, and the volcano has probably already recovered all the co-eruption deflation that occurred in 2011. If this pattern is repeatable, it may be close to being ready to erupt again.