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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Hydrothermal system of the active crater of Aso volcano (Japan) inferred from a three-dimensional resistivity structure model

Fig. 1

Location maps of Aso volcano and the AMT survey area. a Location map of Aso volcano in Japan. The red rectangle corresponds to the area shown in (b). b Elevation map of the entire area of Aso volcano. The study area is indicated by the red rectangle, corresponding to the area shown in (c). c Geological map of the study area (after Ono and Watanabe 1985) showing the distribution of AMT sites (purple circles) used in this study. The lithologies are as follows (from youngest to oldest). a: air-fall ash; Na: youngest pyroclastic cone of Nakadake; Ny (lava flow) and Nc (tuff cone): young volcanic edifice of Nakadake; No: old volcanic edifice of Nakadake; Oj: Ojodake volcano; T: Takadake volcano; Nr: Naraodake volcano; and Os: older small volcanoes. The gray dotted line represents the outline of the Nakadake crater system, and the numbers (1, 3, and 4) within it indicate the locations of the first, third, and fourth craters, respectively. The thin gray lines and thick gray lines represent elevations at 10-m and 50-m intervals, respectively

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