Fig. 8From: Precursory tilt changes associated with a phreatic eruption of the Hakone volcano and the corresponding source modelComparison of observed tilt records with theoretical apparent tilt records. The theoretical records were calculated using the best-fit model, as shown in Table 1. All tilt changes were converted to positive values regardless of their direction. The assumed time functions of source expansion, γ(t), are shown at the bottom of the figureBack to article page