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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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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.