A strong earthquake with recorded magnitude of M6.4 (USGS) hit Chiapas, Mexico at 19:49 UTC on December 17, 2015. The agency is reporting a depth of 96.9 km (60.2 miles). EMSC is reporting M6.4 at a depth of 120 km (74.5 miles). 
According to the USGS, the epicenter was located 11 km (7 miles) ENE of Tres Picos, 30 km (19 miles) NW of Pijijiapan, 40 km (25 miles) ESE of Tonala, 62 km (39 miles) SE of Arriaga, Mexico and 342 km (213 miles) WNW of Guatemala City, Guatemala.
There are about 743 880 people living within 100 km (62 miles) radius.