A magnitude-5.8 earthquake rattled southern Mexico, causing fright, but no significant reported injuries or damage.
Monday's quake was centered 100 kilometers northwest of Tapachula, a city on the border with Guatemala, according to the US Geological Survey.
It shuddered through the southern Mexican state of Chiapas and parts of Guatemala shortly before midday, sending some frightened people running into the streets.
A second magnitude-5.8 earthquake rattled western Mexico later in the day.
The second quake was centered 28 kilometres southwest of Tacambaro, a town in the western state of Michoacan.