PointofInterestRoadSigns.com - Yellowstone National Park - Porkchop Geyser

 

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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

Porkchop Geyser, Porkchop Geyser sign, Norris Geyser Basin Yellowstone National Park  

Close-up view of sign

 

Porkchop Geyser, Porkchop Geyser sign, Norris Geyser Basin Yellowstone National Park

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.

 

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