For the fifth time since December, a volcanic eruption is underway in ... gaseous state (steam), causing steam explosions and tephra fall (ash). There is considerable uncertainty regarding the ...

United States Geological Survey scientists have shared maps that show where ash would fall across the US if a Yellowstone ...

Tephra is a general term for fragments of volcanic rock and lava that are blasted into the air by explosions or carried upward by hot gases. Tephra includes large, dense chunks, light rock debris ...

Hazards associated with lava fountaining include the fallout materials (termed tephra), volcanic gas emissions, and lava flows. Tephra generally accumulates in the area immediately downwind of the ...

Eruptions of steam, ash, and tephra continued until June ... Reno, Nevada. The volcanic areas are best visited in summer and fall. Heavy snows close most of the main road in winter.