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Fig. 5 | Earth, Planets and Space

Fig. 5

From: Precursory tilt changes associated with a phreatic eruption of the Hakone volcano and the corresponding source model

Fig. 5

Tilt motions for 20 s after 7:33 a.m. observed at borehole stations around the central cone. The direction of initial ground motions at NNT and KZY was southwest downward, whereas east or northeast downward initial motions were observed at KZR and KOM. The ground motions observed at each station reversed as time passed. These movements seem to coincide with the subsidence and uplift of the central cone. The inset shows a schematic view of the site location and tilt motions

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