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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

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. 5

Comparison of observed (red arrows) and modeled (blue arrows) tilt vectors of phase 1 (Fig. 3). The location of the modeled crack is represented by the yellow rectangle. Modeled vertical displacement is projected onto a virtual plane at 2100 m asl (corresponding to an altitude of MC) at intervals of 5 mm. Solid and dashed contour lines correspond to vertical uplift and subsidence, respectively. White, red, and gray circles represent hypocenters determined by the KSVO for the periods from 1 January 2016 to 22 January 2018 (before the eruption), from 23 January to 22 April 2018 (after the eruption), and from 22 to 23 April 2018 (representative of SPCG unrest in 2018), respectively. Optimal crack parameters are summarized in the lower right of the figure. The square with the dashed line represents the area shown in Fig. 6

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