The giant crack in the Wyoming–based national park has prompted officials to shut down areas from tourists in case of landslides. WoodTV.com, a US-news site affiliated with NBC, reported: "A 100-foot long fissure has prompted the closing of part of Grand Teton National Park." The Grand Teton National Park said in a statement: “The Hidden Falls and Inspiration Point areas are currently closed due to elevated potential for rockfall. “The area was closed to protect human safety on July 10 after expanding cracks in a rock buttress were detected.

“It is unknown how long the closure will be in effect. Geologists are monitoring the buttress for movement and have initiated a risk assessment for the area.” It is currently unclear how the crack opened but it is likely due to normal seismic activity in the national park area. Despite being around 100 kilometres from the Yellowstone National Park, Grand Teton does sit over the Yellowstone supervolcano. If it was seismic activity beneath Grand Teton which caused the fissure, it could be a sign that Yellowstone is reawakening.

Yellowstone super volcano in pictures Wed, February 14, 2018 The volcano at Yellowstone National Park in Wyoming and Montana sits atop a huge reserve of magma and last erupted 640,000 years ago Play slideshow Getty Images 1 of 18 Belgian Pool, hot spring in the Upper Geyser Basin of Yellowstone National Park, Wyoming

Grand Teton National Park