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Fig. 1 | Earth, Planets and Space

Fig. 1

From: The 2018 phreatic eruption at Mt. Motoshirane of Kusatsu–Shirane volcano, Japan: eruption and intrusion of hydrothermal fluid observed by a borehole tiltmeter network

Fig. 1

Location and topography of Kusatsu–Shirane volcano. a Location map of Kusatsu–Shirane volcano in Japan (star). Blue and red circles represent the locations of the Nagano weather radar site and an aerological observatories using a balloon and radiosonde, respectively (both operated by the Japan Meteorological Agency). b Topographic map of Kusatsu–Shirane volcano. Solid lines are topographic contours at intervals of 30 m. Red squares and circles indicate the locations of tiltmeters installed at the bottom of boreholes and at a depth of 1–2 m from the ground surface, respectively (Table 1). Yellow squares (MC, WC, and SC) indicate the locations of craters that formed during the 2018 eruption. PC = pyroclastic cone; MPCG = Motoshirane Pyroclastic Cone Group; SPCG = Shirane Pyroclastic Cone Group; YCL = Yugama Crater Lake; MC = main crater; WC = west crater; SC = south crater

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