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

The new map shows where volcanic ash would fall in the event of a Yellowstone supereruption, with the supervolcano's last ...

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 ...

a steep-sided volcano comprised of hardened lava and tephra. There are 11 remote seismic stations situated around Mount Spurr. Once the researchers begin to detect volcanic tremor -- a continuous ...

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.

or new volcanic deposits (for example, tephra, and pyroclastic-flow deposits).” Alert Level 1 remains hoisted over the volcano. Phivolcs previously warned that entering Taal Volcano Island and ...