“At its peak, the mountain moved at a speed of 10 centimeters per day, which is a lot,” the geologist Ingrid Skrede said at a news conference in 2016.

The upper part of the mountain, Little Man, known locally as Veslemannen, showed the greatest movement.

“Had Veslemannen fallen in one piece, it could have taken railways, critical infrastructure and homes along with it,” said Kjell-Borge Freiberg, the minister for oil and energy, who had flown in the day after the collapse.

He warned Norwegians to brace for more as the climate shifts, saying, “We know this might happen again, even in places that used to be safe.”

Six other tall mountains in western and northern Norway are under constant monitoring for a potential collapse, because mountains in Norway have collapsed before. The country’s extensive monitoring and prevention program began after a quick clay slide in Verdal took 105 farms with it in 1893, killing 116. Other mountains fell in 1731, 1811, 1905, 1934 and 1936, causing catastrophic tsunamis and multiple deaths.

Because of climate change, scientists in Sweden suspected last year that the highest peak on the country’s Kebnekaise mountain had lost its title because record heat was melting the tip of a glacier that sat atop it. This past week, they confirmed their findings, Gunhild Ninis Rosqvist, a Stockholm University geography professor who had been measuring the glacier annually for several years, told The Guardian.

At the time of the collapse of Little Man, none of the geologists at the Norwegian Water Resources and the Energy Directorate were on the site. Nor did they have to be, according to the geologist Gudrun Dreias Majala, who described how she could track it via digital radar feeds and data from other sensors from her home, more than four hours’ drive away.