On Tuesday morning a 7.4 magnitude earthquake struck 12 km south-southwest of Santa María Zapotitlán, Mexico.
It was at a depth of 23 kilometres.
At least two people have died.
The earthquake also causes a fire at an oil refinery in Salina Cruz. The blaze was quickly extinguished but one worker was injured.
140 aftershocks were recorded, all of which were small.
A tsunami warning was issued as a result of the earthquake, the alerts have long since ended.