Yellowstone National Park in Park County, Wyoming — The American West (Mountains)
The upended rocks before you are the result of Porkchop Geyserís hydrothermal explosion in 1989. Porkchopís vent failed to relieve a surge in underground pressure; it exploded creating another chapter in the geyserís 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. Geologists 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.
Erected by National Park Service.
Location. 44° 43.335′ N, 110° 42.464′ W. Marker is in Yellowstone National Park, Wyoming, in Park County. Marker can be reached from Grand Loop Road (U.S. 89), on the left when traveling north. Touch for map. Marker is located in the Back Basin at Norris Geyser Basin in Yellowstone National Park. Marker is in this post office area: Yellowstone National Park WY 82190, United States of America.
Other nearby markers. At least 8 other markers are within walking distance of this marker. A different marker also named Porkchop Geyser (within shouting distance of this marker); Cistern Spring (approx. 0.2 miles away); Minute Geyser Steamboat Geyser (approx. 0.2 miles away); Echinus (approx. 0.3 miles away); Echinus (approx. 0.3 miles away); Emerald Spring (approx. 0.3 miles away); Yellowstone National Park (approx. 0.4 miles away). Touch for a list and map of all markers in Yellowstone National Park.
More about this marker. Two photographs on the right side of the marker has captions of “Porkchop Geyserís vent has at times been as small as a garden hose.” and “The hydrothermal explosion in 1989 changed Porkchopís vent to approximately 7 feet (2 meters) in diameter.”
Categories. • Natural Features •
Credits. This page was last revised on June 16, 2016. This page originally submitted on September 9, 2015, by Bill Coughlin of North Arlington, New Jersey. This page has been viewed 143 times since then and 21 times this year. Photos: 1, 2, 3, 4. submitted on September 9, 2015, by Bill Coughlin of North Arlington, New Jersey.