Comment Re:a question.... (Score 1) 64
To be fair, if you look at the scale of that thing, what fell is far deeper than tree roots are going to go.
There was a landslide on my land a few years ago... actually just 50-100 meters from where I'm getting ready to build my house (but the terrain is different, that's a groundwater-infiltrated glacial till-underlain marsh while my house site is basalt bedrock). It's weird looking at pictures of this giant slide, how much it looks like a 20x bigger version of my little one, from the smooth, rimmed conchoidal scarp to the river-damming piles of debris at the bottom. In my case, there were no trees, but there was grass. The grass managed to hold it for a while... but not forever. The roots just don't run deep enough. In my case, the solution (in progress) is surely just to plant water-tolerant trees (here's to hoping that dawn redwood and swamp cypress can survive in Iceland...). But what sort of trees could anchor such a massive slope as the Oso one? I know a lot of desert trees like mesquite can have super-deep root systems, but they wouldn't grow in Washington.