Global Volcanism Program | Image GVP-12851
This boulder was part of the lava dome at Sheveluch before a collapse produced the 27 October 2010 block-and-ash-flow that emplaced it 13 km away. The hot dome rock fragmented as it travelled, producing a large amount of ash with a large range of block sizes within the ash matrix.
Photo by Janine Krippner, 2015.
This image is made available under the Creative Commons BY-ND 4.0 license terms.