Mexico Logs New M4.3 and CDMX Microsismos as Peru Notes No Tsunami From Offshore M4.9

Overview

• Mexico’s seismic service reported two early‑morning quakes on March 22: a magnitude 4.3 southwest of Ciudad Hidalgo, Chiapas at 10.9 km depth and a magnitude 4.1 southwest of Salina Cruz, Oaxaca at 36.8 km.
• Mexico City’s Iztapalapa registered two microsismos on March 21, the largest at magnitude 2.3 around 18:51 with a depth of 3 km, and officials reported no damage and no activation of the seismic alert.
• Experts note that local microsismos are shallow, release limited energy, and fall below SASMEX activation thresholds, which are designed for stronger, distant events.
• Peru’s IGP confirmed a magnitude 4.9 offshore quake near Marcona (Ica) at 00:30 on March 20 at 27 km depth, and the Navy’s hydrography directorate ruled out a tsunami; no damage was reported.
• Lima region activity persisted, including a magnitude 3.5 near Chilca at 06:03 on March 22 after several small quakes during the week, as IGP chief Hernando Tavera urged safe construction and readiness.