An earthquake of magnitude 8 M at a depth of 35 km occurred near the southwestern coasts of Chiapas State on 8 September at 4.49 UTC. The epicentre was located approx. 96 km southwest of Pijijiapan city (population 15 400 people). USGS PAGER estimated a shaking up to "Severe" for 161 000 people and up to "Very Strong" for 920 000 people.
The US Tsunami Warning System (NOAA) has issued a tsunami threat minutes after the earthquake. JRC calculations estimated a maximum tsunami of about 2.43 m in Arista (north coast of Chiapas State) for 8 September at 5.39 UTC. A Tsunami is ongoing and is being measured by the local sea level systems. As of 8 September early morning (UTC), there have been no reports of casualties or damage.