The event took place last September and was picked up by sensors all over the world, leading scientists to investigate where it had come from.
Heavy rainfall in the area has been blamed for destabilising the ground on the mountains slopes around San Mateo.
At least three people are dead, and around 80 are still missing, after the Japanese town of Atami was hit by a devastating mudslide.
Over a dozen houses in Bolivia have been destroyed, after a landslide in a hilly suburban area wreaked havoc.