Fig. 1From: Physical characteristics of scoriae and ash from 2014–2015 eruption of Aso Volcano, JapanMap of Aso Volcano. a Location of Aso Volcano. b Map of Aso Caldera and Nakadake. The red square shows the location of Fig. 1c. c Google Earth photograph of the Nakadake craters of Aso Volcano taken April 15, 2016. High-porosity samples are collected at the 3rd crater. Flattened samples are collected around the sites denoted by the white circle. d–f Photographs of plumes without ash emission, during vigorous ash emission, and at the end of ash emission, respectively. f The inset shows a magnification of the sediments. The black spots denoted by white arrows are scoriaeBack to article page