Fig. 7From: Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcanoResult of grid search for the volcanic tremor source in Fig. 6. a Epicenter, b N–S cross section, and c E–W cross section. The red star and gray circles indicate the best location of the tremor source and the results of the bootstrap resampling method, respectively. The colors and contour lines on each diagram show the residual normalized by the maximum value on the section passing through the location of the best solutionBack to article page