The Largest Landslide in Human History (Mount St. Helens)

The Largest Landslide in Human History (Mount St. Helens) The largest landslide in human history lasted less than a minute. On the morning of May 18, 1980, the entire north face of Mount St. Helens detached and slid away, roughly half a cubic mile of rock, ice and glacier, about 2.5 billion tonnes, moving downhill at over 150 miles per hour. It remains the biggest landslide ever recorded, and it happened in seconds. CHAPTERS: 00:00 - The Morning of May 18, 1980 Sets the scene at Spirit Lake and introduces the calm before the catastrophic event. 01:56 - Two Months of Warning Signs Covers the seismic activity and steam vents that preceded the main eruption starting in March. 02:34 - The Growing "Bulge" Details the terrifying 5-feet-per-day horizontal movement of the mountain's north face. 04:12 - The People in the Hazard Zone Profiles Harry Truman, David Johnston, and others who were near the mountain when it failed. 06:04 - 8:32 AM: The Mountain Detaches The moment the 5.1 magnitude earthquake triggered the largest landslide in human history. 07:31 - The Lateral Blast Explains the superheated "cryptodome" pressure release that overtook the landslide at supersonic speeds. 09:36 - "Vancouver! Vancouver! This is it!" The final moments and transmissions of those caught in the immediate blast zone. 10:52 - Erasing the Toutle River Valley The aftermath of the debris flow, the displacement of Spirit Lake, and the resulting lahars. 13:30 - How Mount St. Helens Changed Geology The lasting impact on how volcanologists monitor deformation and assess volcanic hazards worldwide. 15:32 - A Mountain in Pause Reflections on the current state of the crate What part of this had you never heard before? Tell us in the comments. #mountsthelens #volcano #landslide #geology #naturaldisaster #1980 #documentary #eruption