Overview
- At 02:07 local time, a magnitude 4 earthquake struck 7 km southwest of Tonalá, Chiapas, at a depth of 133.4 km, according to the SSN.
- At 00:40, a magnitude 4 event was recorded 202 km southwest of Cihuatlán, Jalisco, at a shallow depth of 10 km.
- At 00:18, a magnitude 4 quake occurred 46 km southwest of Pijijiapan, Chiapas, at a depth of 71 km.
- The SSN also reported several smaller tremors near San Marcos and Ciudad Altamirano, Guerrero, between 04:31 and 04:40 with magnitudes from 3.0 to 3.7, and no seismic alert was activated.
- The SSN’s Jan. 5 summary notes the largest December event was a magnitude 5.5 on Dec. 5 located 228 km southwest of Cihuatlán with a strike-slip focal mechanism.