Pacific Rim Sees Flurry of Moderate Quakes as Guerrero Aftershocks Hit M4.7

Overview

• Mexico’s national network logged 38 earthquakes overnight on January 24, including six above magnitude 4, with the largest at 4.4 near Ciudad Hidalgo, Chiapas.
• The Guerrero sequence from the January 2 M6.5 mainshock continued with a M4.1 near San Marcos in the morning and a later M4.7 at 16:28, with roughly 5,500 aftershocks reported by 08:00 and no significant damage noted.
• SASMEX said the morning M4.1 did not meet its thresholds for a public alert, while users reported SASSLA app notifications before official posts, illustrating varied early‑warning behavior by event.
• Peru’s IGP/CENSIS confirmed a M4.2 quake 90 km southwest of Pisco on January 23 and a M4.0 near Atico in Arequipa, with authorities reporting no major damage.
• The USGS cataloged multiple events across North America, including about M5.0 near Attu Station, Alaska, and a M4.7 near Evanston, Wyoming, as agencies maintained near‑real‑time monitoring and safety guidance.