Earthquake Alert: M5.0 Event Detected in the Pacific region

A magnitude 5.0 earthquake struck the Pacific region at 17:46 UTC on Wednesday, September 23, 2026, according to data from the United States Geological Survey (USGS). The earthquake's epicentre was located 140 km NNE of Ba, Fiji, at a focal depth of 10.0 km.

Event Details

At a focal depth of 10.0 km, this is classified as a shallow earthquake (0–70 km). Shallow events are typically the most damaging: the seismic energy has less distance to travel before reaching the surface, resulting in stronger and more abrupt ground shaking at the epicentre.

The earthquake registered a magnitude of 5.0 on the moment magnitude scale — the standard measurement used by seismologists worldwide. At this magnitude, the shaking is felt strongly by everyone; minor to moderate damage possible in vulnerable buildings.

Where Did This Earthquake Occur?

The Pacific Ocean basin is ringed by the world's most active subduction zones, collectively known as the Ring of Fire. This region produces approximately 90% of the world's earthquakes and the great majority of its major tsunamis.

Pacific island nations face unique challenges: small land areas, limited evacuation options, and direct exposure to both strong shaking and tsunami inundation. The Pacific Tsunami Warning Center (PTWC) in Honolulu monitors the entire Pacific basin and issues alerts to member nations.

What Does Magnitude 5.0 Mean?

Moderate earthquakes are felt by virtually everyone near the epicentre. Strong shaking lasting 10–30 seconds can topple unsecured items, crack plaster, and cause poorly anchored objects to fall. Aftershocks are common following moderate events.

Significant damage can occur to vulnerable structures — particularly unreinforced masonry, old adobe buildings, and poorly maintained older construction. Well-engineered modern buildings are designed to withstand this level of shaking with minimal structural impact, though contents may shift and non-structural elements (ceilings, partitions) can be damaged.

A magnitude 5.0 earthquake releases approximately approximately 30,000 tonnes of TNT — comparable to the Hiroshima atomic bomb of energy. For comparison, this exceeds the energy released by most conventional explosive events and is sufficient to shift tectonic stress in measurable ways across a wide region.

Safety Guidance

The internationally recommended action during earthquake shaking is Drop, Cover, and Hold On: drop to your hands and knees, take cover under a sturdy table or desk (or protect your head with your arms if no shelter is available), and hold on until shaking stops. Do not run outside during shaking — most injuries occur when people attempt to move.

Fasten heavy furniture — bookshelves, water heaters, cabinets — to walls using earthquake straps. Store breakable items on lower shelves and heavy items closest to the floor. These simple steps significantly reduce the risk of injury from falling objects.

Coastal communities throughout the Pacific should treat any strong earthquake as a potential tsunami warning and move inland or to elevated ground without waiting for an official alert.

Monitoring and Aftershocks

Seismologists are continuing to monitor the region for aftershocks, which are common following earthquakes of this magnitude. Aftershocks can occur minutes, hours, or even days after the main event and are sometimes strong enough to cause additional damage to already-weakened structures. Residents in the area are advised to remain cautious and follow guidance from local authorities.

Real-time seismic data is being collected by the USGS and contributing regional networks. Updated information will be published as it becomes available. You can track this and all other global seismic activity in real time on our live earthquake map.

How QuakeWatch Tracks This Event

QuakeWatch sources earthquake data directly from the USGS ComCat (Comprehensive Catalog), which aggregates data contributed by seismic networks worldwide including JMA (Japan), EMSC (Europe and Mediterranean), GFZ (Germany and global), Geoscience Australia, and dozens of national and regional networks. This data is refreshed every 60 seconds, ensuring that new earthquakes appear on our live map within minutes of being processed by the USGS. You can also submit a felt report for this earthquake directly on its detail page.