What is Subsurface fire?

Subsurface fire is like when something underground starts burning without you seeing it happen.

Imagine you have a big pile of wood chips under your backyard, and they're all dry and ready to catch fire. One day, a spark from the grill hits the top of the pile, but instead of a flame leaping up, it just sizzles through the wood like it’s going on a secret journey underground.

Subsurface fire is when this kind of burning happens deep inside the ground, sometimes in forests or even under cities! It's not like regular fires you see above ground. Instead of flames, there are hot spots and smoldering layers that burn slowly over time, like a sleepy campfire that won't go out.

If you’ve ever stepped on something hot in the kitchen, like a pan that's still burning, you know how surprised it can be. Subsurface fire is kind of like that, but way bigger! It can make the ground shake or even cause little bursts of flame to pop out randomly.

It’s not magic, it’s just fire doing its thing in a place we don’t always see.