The 2012 Guerrero–Oaxaca earthquake struck southern Mexico with a moment magnitude of 7.4 at 12:02 local time on Tuesday, 20 March.

With a shallow focus of 20 km, the earthquake caused strong shaking over a large area along the Oaxaca–Guerrero border and the adjacent Pacific coastline.

[15] The earthquake caused power outage in central and eastern Mexico and affected 2.5 million users according to Comisión Federal de Electricidad (CFE).

The first died due to the injuries caused after a wall collapsed on him in El Tamale community, while the second suffered a heart attack, in San Nicolás.

[17] The strongest ground motions registered at very strong (MM VII) on the Mercalli intensity scale, affecting smaller cities and towns near the epicenter such as San Juan Cacahuatepec, Cuajinicuilapa, Ometepec and Pinotepa Nacional.

[15][18][19][20][21][22][23][24][25] The intensity in Mexico City was MM VI–VII, which was stronger than the surrounding area because of local topography and soil conditions.

[26] Part of a pedestrian bridge collapsed on a small passenger bus in Azcapotzalco, Mexico City, with no injuries reported.