As per the United States Geological Survey (USGS), a magnitude 5.8 earthquake struck approximately 60 kilometres southwest of Puerto Madero, Chiapas, Mexico, at 2335 hours local time (0535 hours UTC on 28 July) on Monday (27 July). The earthquake occurred at a depth of 35 kilometres. The event has been reviewed by the USGS. No immediate reports of casualties or damage have been issued.

Reports indicate the earthquake occurred at a depth of 35 kilometres and was assigned a Green PAGER, indicating a low likelihood of significant fatalities or economic losses.