NOUMÉA, July 13 — A magnitude 6.3 earthquake struck southeast of the Loyalty Islands on July 13, 2026, at 14:45 UTC, according to the U.S. Geological Survey (USGS). The quake occurred at a shallow depth of 10 kilometers, and no tsunami warning was issued.
The Loyalty Islands region is no stranger to seismic activity. The USGS has recorded at least 500 earthquakes of magnitude 5.0 or greater within about 300 kilometers of this location over the past two decades. The strongest among them was a magnitude 7.7 earthquake in 2023.
What a shallow quake means for communities
At a depth of just 10 kilometers, this was a shallow earthquake. Shallow events—those less than 70 kilometers deep—typically produce stronger shaking at the surface than deeper earthquakes of the same magnitude, seismologists explain. For communities living near the epicenter, the difference can be significant: the same magnitude 6.3 event would feel far more violent if it originates close to the surface.
Earthquakes in the magnitude 6 range are classified as strong. In populated areas close to the epicenter, such shaking can cause significant damage to buildings and infrastructure. While the Loyalty Islands themselves are relatively sparsely populated, the broader region includes island communities across New Caledonia and nearby island nations where residents would have felt the ground move.
Aftershocks expected in coming days
Seismologists note that aftershocks are common following an earthquake of this size. They may continue for days or even weeks after the main event. People in the affected area are generally advised to be prepared for further shaking, as aftershocks can sometimes be strong enough to cause additional damage to structures already weakened by the initial quake.
The USGS detected the event through its real-time global seismic monitoring network, which tracks earthquakes worldwide as they happen. This network allows scientists to quickly determine the location, magnitude, and depth of seismic events, providing critical information for emergency responders and the public.
Seismic history of the region
The area southeast of the Loyalty Islands sits in a tectonically active zone where the Australian Plate meets the Pacific Plate. This boundary has produced numerous significant earthquakes over the past two decades, with the 2023 magnitude 7.7 event standing as the most powerful recorded within about 300 kilometers of the latest quake.
For families across the broader region, the July 13 earthquake serves as another reminder of the seismic risks that come with living in this part of the Pacific. While no tsunami warning was issued this time, the shallow depth and magnitude of the event mean that communities should remain alert for potential aftershocks in the days ahead.
