The 2017 Chiapas earthquake struck at 23:49 CDT on 7 September (local time; 04:49 on the 8th UTC) in the Gulf of Tehuantepec off the southern coast of Mexico near the state of Chiapas, approximately 87 kilometres (54 mi) southwest of Pijijiapan (alternately, 101 kilometres (63 mi) south-southwest of Tres Picos),[6] with a Mercalli intensity of IX (Violent).

[1] The earthquake caused all of Mexico City to tremble, prompting people to evacuate after the early warning system was triggered.

[15] According to the National Seismological Service (SSN) of Mexico, the epicenter was located in the Gulf of Tehuantepec, about 137 kilometres (85 mi) southeast of Tonalá, Chiapas.

[16] The United States Geological Survey (USGS) reported that the epicenter was about 87 kilometres (54 mi) southwest of Pijijiapan, Chiapas.

The Secretariat of the Interior declared a state of emergency for 122 municipalities in Chiapas,[27] and the Mexican Army was deployed to aid in disaster relief.

[30] Buildings in Juchitán de Zaragoza, Oaxaca, closest to the epicenter, were "reduced to rubble" according to reports from the town's mayor.

[34] On 11 September, Mexico recalled its aid to the United States, offered in the aftermath of Hurricane Harvey, to focus on earthquake recovery.