DETROIT – Jahn Martin was visiting Pictured Rocks National Lake when A piece of cliff of 200 meters he suddenly broke off and fell into Lake Superior.
The video captured the entire scene.
He was in a pontoon with some friends when they heard the wall crack and crack, Mid-Michigan told Now. Then within 60 seconds the face of the cliff slid down and crashed into the water.
“We could hear cracking and cracking of the cliff wall and within 60 seconds one part of the cliff about 200 meters wide fell in front of us,” Martin told WLUC-TV. “The wave of splashing and swelling was very dramatic.”
Rock slopes can occur for a variety of reasons, ranging from water leakage between any cracks to earthquakes to vegetation growth. Variations in temperature and extreme heat can also lead to instability, according to National Park Service. The cliffs of the park are located at an altitude of 50 to 200 feet above the lake.
Still, the park service says it is difficult to determine a specific trigger for individual rock slopes, including the one Martin witnessed.
There was a similar collapse in 2019, when kayakers on a hair tour avoided injury when much of the cliff collapsed on Superior Lake.
The Associated Press contributed to this story.