Blowdown of trees from the shock-wave of the directed (lateral) bla...
Detailed Description
Blowdown of trees from the shock-wave of the directed (lateral) blast from the May 18, 1980 eruption of Mount St. Helens. Elk Rock is the peak with a singed area on the left.
Related
1980 Cataclysmic Eruption
Magma began intruding into the Mount St. Helens edifice in the late winter and early spring of 1980. By May 18, the cryptodome (bulge) on the north flank had likely reached the point of instability, and was creeping more rapidly toward failure.
Pyroclastic Surges Hazards at Mount St. Helens
Pyroclastic surges are less dense than pyroclastic flows, but are highly turbulent mixtures of gas and rock that flow at rapid velocities just above the ground surface.
Related
1980 Cataclysmic Eruption
Magma began intruding into the Mount St. Helens edifice in the late winter and early spring of 1980. By May 18, the cryptodome (bulge) on the north flank had likely reached the point of instability, and was creeping more rapidly toward failure.
Pyroclastic Surges Hazards at Mount St. Helens
Pyroclastic surges are less dense than pyroclastic flows, but are highly turbulent mixtures of gas and rock that flow at rapid velocities just above the ground surface.