Fig. 11
From: Physical characteristics of scoriae and ash from 2014–2015 eruption of Aso Volcano, Japan
Photographs of (a, b) powder-like ash and c a sintered ash plate. a Before and b after the permeability measurement. The diameter of the sieve is 75 mm, and the thickness of the ash layer is 5 mm. b The blue circle indicates the pipe-like structure. A rubber ring used for sealing is placed on the sieve rim. c The brownish ash plate is embedded in a plastic case