Fig. 6

Stationarity of the pore-fluid pressure field. The profiles and vertical lines in a–f are displayed in the same way as in Fig. 3. The red and blue lines denote the pore-fluid pressures estimated from the dataset from June 2009 to August 2012 (“FMT analysis around Mt. Ontake” section) and that from September 2012 to July 2014, respectively. The color shaded zones and red inverse triangles are the same as those in Fig. 5