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Welcome
to Point of Interest Road
Signs! A
collection of photos of road and trail signs. Click
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Yellowstone
National Park - Porkchop Geyser
Location
of sign - the Norris Geyser Basin trail in Yellowstone National Park
Photo
taken June 2008
Close-up
view of sign
Wide
view of sign
Text
of sign:
Porkchop
Geyser
Explosive
Change
The
upended rocks before you are the result of Porkchop Geyser's hydrothermal
explosion in 1989. Porkshop's vent failed to
relieve
a surge in underground pressure: it exploded creating another chapter the
geyser's dramatic history of change. Porkchop has
behaved
as a quiet hot spring, a geyser, a perpetual spouter, and after the
explosion, a hot spring again. Geologist attribute changes
like
the 1989 explosion to geologic events underground - heat shifts, earthquakes,
mineral build-up, and pressure changes. Exactly
which
event often remains a mystery.
Porkchop
Geyser's vent has at times been as small as a garden hose. The
hydrothermal explosion in 1989 changed Porkchop's
vent
to approximately 7 feet (2 meters) in diameter.
Graphics
on the sign
In addition
to the text there is a picture of Porkchop Geyser before and after the
hydrothermal explosion.
Please help us
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