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Explainer: After an earthquake, how does a tsunami happen?
Friday's earthquake off Mexico was the largest in that region in over a century, and will add pressure to a region already being battered by several other natural disasters.
The earthquake occurred off the west coast of southern Mexico 69 km below the surface, with a magnitude of 8.1, making it the largest earthquake worldwide since 2015, when a magnitude 8.4 generated a tsunami off the coast of Chile.
It will be some time before we know the full extent of the earthquake damage in Mexico. Recent assessments recorded more than 60 deaths and significant damage.