Fig. 2From: Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcanoHypocenter distribution of VT earthquakes that occurred from April 22 to August 31, 2015. a Epicentral distribution, b depth distribution along the N–S section, c depth distribution along the E–W section, d time-depth distribution. The red line indicates the cumulative number of VT earthquakes. The color of each circle indicates the time elapsed from April 22, 2015Back to article page