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Volcanic ash (fragmented rock, crystals, and glass) can be the most far-reaching product and hazard during volcanic eruptions. Ash plumes can result in thick, heavy deposits near the volcano that can cause roofs, powerlines, branches, and other structures to collapse. Even a thin layer of ash on roads can make surfaces slick and dangerous. Depending on how fine the ash is, how prolonged the exposure is, and pre-existing conditions a person has, health impacts include respiratory effects, eye symptoms, skin irritation, and indirect effects (like injury from falling structures).
Soldiers search the town of El Naranjo, 7.5 km south of the crater, a few days after the end of the eruption amidst remobilized ash. Approximately 2,000 people were killed, among them were one geologist and 32 soldiers sent to the village of Francisco León, ~ 6 km SW of the summit, after the 28-29 March explosion. The pyroclastic flow that traveled through Francisco León left only a thin deposit, but the only remaining structure in the village was remnants of the church.
The city of Rabaul lies buried beneath a thick blanket of ash from the 1994 eruption. Mount Kombiu rises to the west above the deserted streets of the town. Ashfall from Tavurvur volcano during the first few days of the eruption caused widespread damage. Virtually every building in the south part of the town collapsed. Heavy rainfall at the time of the eruption produced lahars that caused additional damage.
Pumice from the 1929 eruption of Komagatake covers streets and buildings in the town of Shikabe.
Heavy ashfall from the 15 June 1991 eruption of Pinatubo volcano caused the roof of this warehouse at Clark Air Base to collapse. The base had been evacuated prior to the major explosion on the 15th.