Skip to main content
Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

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. 8

Tracks of the ash cloud. Red bars represent ash height detected by the Nagano weather radar (blue circle in Fig. 1a) at 2, 5, and 7 km from the MC at 10:05–10:10 (JST) (Meteorological Research Institute 2018). Geometries of a buoyant plume were calculated with Eq. 1 and 2, assuming a wind speed of 20 m/s (solid lines) and 30 m/s (dashed lines). Values in the figure indicate the heat discharge rate \(\dot{q}\) in GW (109 W), as defined in Eq. (2). The source of the plume is fixed to the location of the MC

Back to article page