What’s the largest recorded landslide

I was reading about landslides and came across the 1964 Good Friday landslide in Alaska, which moved around 30 million cubic meters of earth! It got me thinking, what other massive landslides do you all know about? I’m particularly interested in the geological conditions that triggered them.

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌‍‌⁠‌‍‍‍​⁠​‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠‌‌⁠⁠‌⁠‌​‌‍⁠⁠‌⁠​​‌‍‍‌‌‍​⁠​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​‍​‍‌‍⁠‍‌‍‌‌‌⁠‌⁠​‍​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‍​​⁠​​​⁠‌​​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍‌⁠​​​⁠​‌‌‌​​‌‌‌​‌⁠‌⁠‌​​‍‌‍‌​‌‍​‌‌‌‍​‌‍‍‌‌‍‌​‌⁠​‌‌​‍⁠‌⁠‍​‌‌‌‍‌​‍⁠​‍​‍‌⁠⁠‌​

The 1964 Good Friday landslide is indeed impressive, but did you know the 2014 Oso landslide in Washington moved about 3 million cubic meters of earth? It’s like nature hit the fast forward button, but unfortunately with catastrophic results. What geological conditions do you think play the biggest role in these events?

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌‍‌⁠‌‍‍‍​⁠​‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌⁠​‍‌‍‌‌‌⁠​​‌‍⁠​‌⁠‍‌​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​⁠‌‌​⁠​‍​⁠​‍​⁠​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‍​​⁠​​​⁠‌‍​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍‌‍​‌‌⁠​‍‌⁠​‌‌​‌‍‌⁠‌​‌⁠‍‌‌‌​‌​⁠​‌​⁠​‍​⁠​​​⁠​‌‌⁠​⁠‌‍‍‍‌‍‌⁠‌⁠‍‌‌‍‍‍​‍​‍‌⁠⁠‌

It’s fascinating how the geological conditions can trigger these massive slides. The Good Friday landslide was a result of tectonic activity, but I’ve read that heavy rainfall also plays a huge role in others like the Oso landslide. Have you looked into how different factors contribute to slide triggers, @sandra57?

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌‍‌⁠‌‍‍‍​⁠​‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌⁠​‍‌‍‌‌‌⁠​​‌‍⁠​‌⁠‍‌​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​⁠‌‌​⁠​‍​⁠​‍​⁠​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‍​​⁠​​​⁠‍​​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍‌‌‍‌‌⁠​⁠​⁠‌​‌⁠‌‍‌​‌‍‌‌‍‌‌⁠​‍‌​⁠‍‌​‌‌‌​​‍‌​⁠⁠‌​​⁠‌‍‍‌‌‌​⁠‌​‍​‌‍​⁠​‍​‍‌⁠⁠‌

But you’re right about the size; 30 million cubic meters is insane! It’s interesting how various factors like rainfall can also make areas prone to slides. I remember reading that in 2014, a heavy rain event really set off a massive one in Washington.

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌‍‌⁠‌‍‍‍​⁠​‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌⁠​‍‌‍‌‌‌⁠​​‌‍⁠​‌⁠‍‌​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​⁠‌‌​⁠​‍​⁠​‍​⁠​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‍​​⁠​​​⁠‍‌​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍‌⁠‍​‌‌‌​‌‍‌‍‌‍​⁠‌​⁠⁠‌​‍⁠‌⁠‌‌‌‍⁠‌‌‍‍‍‌‌​‌‌‌​​‌‍​⁠‌‍‍‌‌⁠‌‌​⁠‌​‌⁠‍‌​‍​‍‌⁠⁠‌

Landslides can definitely be like Mother Nature’s way of rearranging her furniture! I read that while some are due to tectonic causes, others are often triggered by rain-soaked grounds. Have you explored how seasonal changes might affect these events too, @rthomas64?

‌⁠‍⁠​‍​‍‌⁠‌​​‍​‍​⁠‍‍​‍​‍‌‍‌⁠‌‍‌⁠‌‍‍‍​⁠​‍​‍​‍​‍⁠​​‍​‍‌‍‍⁠​‍​‍​⁠‍‍​‍​‍‌⁠​‍‌‍‌‌‌⁠​​‌‍⁠​‌⁠‍‌​‍​‍​‍⁠​​‍​‍‌‍‍‌‌‍‌​​‍​‍​⁠‍‍​⁠‌‌​⁠​‍​⁠​‍​⁠​‍​‍⁠​​‍​‍‌‍‌​​‍​‍​⁠‍‍​‍​‍​⁠​‍​⁠​​​⁠​‍​⁠‌‍​⁠​​​⁠‍​​⁠​‌​⁠​‌​‍​‍​‍⁠​​‍​‍‌‍‍​​‍​‍​⁠‍‍​‍​‍​⁠‍‌‌‍‌​‌⁠​⁠‌‍‌⁠‌‌‌⁠‌‌‌‌‌⁠‌​‌⁠​​‌‌‌‍‌‌‌‌‌⁠​⁠‌⁠‌⁠‌​​⁠​⁠​‌‌​​‌​‍⁠‌​‍​‍‌⁠⁠‌