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Fig. 8 | Earth, Planets and Space

Fig. 8

From: Reconstruction of a phreatic eruption on 27 September 2014 at Ontake volcano, central Japan, based on proximal pyroclastic density current and fallout deposits

Fig. 8

M dσ φ plot. All data from the Ontake eruption are plotted outside the areas for pyroclastic flow and fallout deposits (Walker 1971), but overlap the data for fallout deposits from phreatic eruptions and aggregate-forming eruptions (shaded areas Bandai 1883, Yamamoto et al. 1999; Mount St. Helens 1980 (AL: accretionary lapilli), Hoblitt et al. 1981; Adatara 1900, Fujinawa et al. 2008). The Te Maari eruption, Tongariro 2012 (surge unit C and ash fall, Lube et al. 2014), yielded similar but slightly smaller σ φ . The gray, thick broken line indicates the data for hydrovolcanic fine ash beds summarized by Sheridan and Wohletz (1983)

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