Overview

• The quake struck at 21:55 local time on September 3 near Manzanillo, Colima, and was felt in several Jalisco municipalities.
• Mexico’s SSN placed the epicenter 18 km northeast of Manzanillo, while Jalisco’s seismic network reported it 0.5 km east at 16 km depth, reflecting routine variations in early estimates.
• UNAM’s monitor logged coordinates near 19.18° N, −104.22° with an approximate depth of 15 km.
• SASMEX sirens did not activate because the event fell below established distance‑magnitude thresholds for public alerts.
• Jalisco’s civil protection carried out coastal inspections and reported no affectations, as a separate magnitude 4.2 quake off Sayula de Alemán, Veracruz at 05:28 on September 4 also caused no damage.