This is a cellular automaton. It´s done with Matlab, and is the classic fire forest model. Each run you have for each cell:
If is empty, there is a probability of a new tree to born.
If is with tree, there is a probability of starting a fire.
If is in fire and is surrounded by tress, there is a probability of fire starting on next trees on the lattice. And in next run is empty.
In this particular simulation the initial condition is all empty of trees.

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