Under the revised hazard map, which also reflects topographical details, there are now 27 municipalities at risk of a lava flow from the 3,776-meter peak. The volume of a possible pyroclastic flow ...

The Valley of 10,000 Smokes was formed when a 35 cubic km pyroclastic flow filled a former river valley. A two hundred foot thick deposit of hot ash heated the stream and ground water under the ...

“[An ash cloud is] a dilute part of the pyroclastic flow. It’s usually formed at the edges, above and laterally, where most of the material is like an avalanche or landslide, but the ...