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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Estimating the ashfall volume for a small eruption using ellipse-approximated isopach analysis: how many seeking points are required to determine a suitable axis?

Fig. 4

Calculation results of the EAI distributions for the eruption at 15:34 on June 27. a The one-point seeking result of the minimum (1), average close (2), and maximum (3) EAI volume cases. b The two-point seeking result of the minimum (1), average close (2), and maximum (3) EAI volume cases. c The three-point seeking result of minimum (1), average close (2), and maximum (3) EAI volume cases. d The four-point seeking result of minimum (1), average close (2), and maximum (3) EAI volume cases. Numerical values are the amounts of ashfall (g/m2) to the points and axis angle (°) of the calculation. Blue dashed lines are the 0 and 40-g/m2 isolines obtained via the field survey, and the black line is the 40-g/m2 isoline obtained via the EAI calculation. Results of cases are shown in Additional file 3: Table S3

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