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Pacific Palisades home left standing by wildfire breaks apart in landslide
(www.nbclosangeles.com)
this post was submitted on 17 Jan 2025
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The parched hillsides with sparse vegetation don't accommodate many tonnes of water being dumped onto them from the air.
Ultrahot fires these days tends to loosen up the top foot or two of soil both through root burnout and pure thermal expansion. I know in the burn areas near my house, if you go out a month after the fire your boots will practically disappear in dry topsoil flour. Add literally any water and it turns into soup.
The topsoil becomes hydrophobic for a time due to the vaporized oils in plants and a bunch of physics I am fuzzy on. This means they're less likely to absorb any water during the next rains after a wildfire and you get what are called post-wildfire debris flows (a type of mass wasting/landslide). They're so predictable that planning for them and predicting where they will occur is a regular part of wildfire response in certain states.
Your boots may sink into soup and add any sort of slope and that hillside is going down.