2017 Chiapas earthquake
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| Date | 7 September 2017 |
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| Origin time | 23:49:21 CDT |
| Magnitude | 8.1 Mw |
| Depth | 69.7 km (43.3 mi) |
| Epicenter | 15°04′05″N 93°42′54″W / 15.068°N 93.715°WCoordinates: 15°04′05″N 93°42′54″W / 15.068°N 93.715°W |
| Areas affected | Mexico, Guatemala |
| Max. intensity | IX (Violent) |
| Tsunami | Yes |
| Foreshocks | 1 |
| Aftershocks | 3,831 |
| Casualties | 98 dead, 300+ injured |
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 state of Chiapas, approximately 87 kilometres (54 mi) south of Pijijiapan, with a Mercalli intensity of IX (Violent). The magnitude was estimated to be Mw 8.1.
The earthquake caused some buildings in Mexico City to tremble, prompting people to evacuate. It also generated a tsunami with waves of 1.75 metres (5 ft 9 in) above tide level; and tsunami alerts were issued for surrounding areas. Mexico's president called it the strongest earthquake recorded in the country, in a century. It was also the second strongest recorded in the country's history, behind the magnitude 8.6 earthquake in 1787, and the most intense recorded globally, so far in 2017.
The Gulf of Tehuantepec lies above the convergent boundary where the Cocos Plate is being subducted below the North American Plate at a rate of 6.4 cm/yr (2.5 in/yr).
On 6 September, several earthquake alarms in Mexico City were mistakenly activated and prompted the evacuation of buildings. The incident prompted a review of the system.
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. The United States Geological Survey (USGS) reported that the epicenter was about 87 kilometres (54 mi) southwest of Pijijiapan, Chiapas. The SSN reported a measurement of M 8.2, while the USGS reported a M 8.1 earthquake after correcting an earlier estimate of M 8.0. The earthquake moved the fault between the Cocos and North American plates by up to 10 metres (33 ft).
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