M5.2 Earthquake in the Kermadec Islands region — July 29, 2026

On July 29, 2026 at 22:42 UTC, a magnitude 5.2 shallow crustal earthquake struck in the Kermadec Islands region, at a depth of 10.0 km and coordinates -28.5591°, -176.6372°. This earthquake was detected by 50 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 416, placing it among routine seismic activity.

Physical scale: An earthquake of magnitude 5.2 releases seismic energy equivalent to roughly 951 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 2.3 km — a useful intuition for the size of the slip patch on the fault.

This earthquake is part of an ongoing aftershock sequence following the magnitude 5.9 mainshock that occurred 1 hour ago in the Kermadec Islands region. Since the mainshock, the USGS has recorded 1 aftershocks in this area. Aftershock activity is expected to continue for days to weeks as stresses on surrounding faults redistribute.