Mt. St. Helens and Catastrophism
Posted: Thu 02 Oct 2014 6:59 am
Mt. St. Helens and Catastrophism
by Steven A. Austin, Ph.D.
The eruption of Mount St. Helens in Washington State on May 18, 1980, is certain to be remembered as one of the most significant geologic events in the United States of the 20th century. The explosion, on May 18, was initiated by an earthquake and rockslide involving one-half cubic mile of rock. As the summit and north slope slid off the volcano that morning, pressure was released inside the volcano - where super hot liquid water immediately flashed to steam. The northward-directed steam explosion released energy equivalent to 20 million tons of TNT, which toppled 150 square miles of forest in six minutes. In Spirit lake, north of the volcano, an enormous water wave, initiated by one-eighth cubic mile of rockslide debris, stripped trees from slopes as high as 850 feet above the pre-eruption water level. The total energy output, on May 18, was equivalent to 400 million tons of TNT - approximately 20,000 Hiroshima-size atomic bombs.
On May 18 and also during later eruptions, critical energy thresholds were exceeded by potent geologic processes which were able to accomplish significant changes in short order. These processes challenge the traditional uniformitarian way of thinking about how the earth works, and serve as a miniature laboratory for catastrophism. Institute for Creation Research scientists have spent three summers investigating the geologic changes which have occurred at the volcano. Four of the most significant discoveries are summarized in this short report.
RAPIDLY FORMED STRATIFICATION
Up to 400 feet thickness of strata have formed since 1980 at Mount St. Helens. These deposits accumulated from primary air blast, landslide, waves on the lake, pyroclastic flows, mudflows, air fall, and stream water. Perhaps the most surprising accumulations are the pyroclastic flow deposits amassed from ground-hugging, fluidized, turbulent slurries of fine volcanic debris, which moved at high velocities off the flank of the volcano as the eruption plume of debris over the volcano collapsed. These deposits include fine pumice ash laminae and beds from one millimeter thick to greater than one meter thick, each representing just a few seconds to several minutes of accumulation. A deposit accumulated in less than one day, on June 12, 1980, is 25 feet thick and contains many thin laminae and beds. Conventionally, sedimentary laminae and beds are assumed to represent longer seasonal variations, or annual changes, as the layers accumulated very slowly. Mount St. Helens teaches us that the stratified layers commonly characterizing geological formations can form very rapidly by flow processes. Such features have been formed quickly underwater in laboratory sedimentation tanks, and it should not surprise us to see that they have formed in a natural catastrophe.
RAPID EROSION
Erosion during volcanic eruptions at Mount St. Helens was accomplished by scour from steam blast, landslide, water waves, hot pumice ash flows (pyroclastic flows), and mudflows. Since the eruptions, the erosion process has been dominated by sheet flooding and channelized flow of water, with occasional mudflows. About 23 square miles of the North Fork of the Toutle River Valley was obstructed by two-thirds cubic mile of landslide and pyroclastic debris, which has been rapidly eroded since 1980. Jetting steam from buried water and ice under hot pumice reamed steam explosion pits with associated mass-wasting processes at the margins of pits, producing rills and gullies over 125 feet deep. Photographic documentation assembled by ICR scientists demonstrates that very pronounced rills and gullies had formed at the margins of seam explosion pits before May 23 - less than five days after the pumice was deposited. The rills and gullies resemble badlands topography, which geologists have usually assumed required many hundreds or even thousands of years to form.
Read more:
http://www.icr.org/article/mt-st-helens-catastrophism/
http://www.scienceclarified.com/Ca-Ch/Catastrophism.html
http://creation.com/flood-geology-secular-catastrophism
by Steven A. Austin, Ph.D.
The eruption of Mount St. Helens in Washington State on May 18, 1980, is certain to be remembered as one of the most significant geologic events in the United States of the 20th century. The explosion, on May 18, was initiated by an earthquake and rockslide involving one-half cubic mile of rock. As the summit and north slope slid off the volcano that morning, pressure was released inside the volcano - where super hot liquid water immediately flashed to steam. The northward-directed steam explosion released energy equivalent to 20 million tons of TNT, which toppled 150 square miles of forest in six minutes. In Spirit lake, north of the volcano, an enormous water wave, initiated by one-eighth cubic mile of rockslide debris, stripped trees from slopes as high as 850 feet above the pre-eruption water level. The total energy output, on May 18, was equivalent to 400 million tons of TNT - approximately 20,000 Hiroshima-size atomic bombs.
On May 18 and also during later eruptions, critical energy thresholds were exceeded by potent geologic processes which were able to accomplish significant changes in short order. These processes challenge the traditional uniformitarian way of thinking about how the earth works, and serve as a miniature laboratory for catastrophism. Institute for Creation Research scientists have spent three summers investigating the geologic changes which have occurred at the volcano. Four of the most significant discoveries are summarized in this short report.
RAPIDLY FORMED STRATIFICATION
Up to 400 feet thickness of strata have formed since 1980 at Mount St. Helens. These deposits accumulated from primary air blast, landslide, waves on the lake, pyroclastic flows, mudflows, air fall, and stream water. Perhaps the most surprising accumulations are the pyroclastic flow deposits amassed from ground-hugging, fluidized, turbulent slurries of fine volcanic debris, which moved at high velocities off the flank of the volcano as the eruption plume of debris over the volcano collapsed. These deposits include fine pumice ash laminae and beds from one millimeter thick to greater than one meter thick, each representing just a few seconds to several minutes of accumulation. A deposit accumulated in less than one day, on June 12, 1980, is 25 feet thick and contains many thin laminae and beds. Conventionally, sedimentary laminae and beds are assumed to represent longer seasonal variations, or annual changes, as the layers accumulated very slowly. Mount St. Helens teaches us that the stratified layers commonly characterizing geological formations can form very rapidly by flow processes. Such features have been formed quickly underwater in laboratory sedimentation tanks, and it should not surprise us to see that they have formed in a natural catastrophe.
RAPID EROSION
Erosion during volcanic eruptions at Mount St. Helens was accomplished by scour from steam blast, landslide, water waves, hot pumice ash flows (pyroclastic flows), and mudflows. Since the eruptions, the erosion process has been dominated by sheet flooding and channelized flow of water, with occasional mudflows. About 23 square miles of the North Fork of the Toutle River Valley was obstructed by two-thirds cubic mile of landslide and pyroclastic debris, which has been rapidly eroded since 1980. Jetting steam from buried water and ice under hot pumice reamed steam explosion pits with associated mass-wasting processes at the margins of pits, producing rills and gullies over 125 feet deep. Photographic documentation assembled by ICR scientists demonstrates that very pronounced rills and gullies had formed at the margins of seam explosion pits before May 23 - less than five days after the pumice was deposited. The rills and gullies resemble badlands topography, which geologists have usually assumed required many hundreds or even thousands of years to form.
Read more:
http://www.icr.org/article/mt-st-helens-catastrophism/
http://www.scienceclarified.com/Ca-Ch/Catastrophism.html
http://creation.com/flood-geology-secular-catastrophism