The Fiji Seismology Unit has released its Earthquake Summary for December 2025, indicating that a total of 435 earthquakes were detected throughout the month. Interestingly, only two of these tremors were reported by members of the public as felt events.
The magnitude of these seismic occurrences varied, with the lowest recorded at 1.1 and the highest at 5.7. Among the felt earthquakes, a significant magnitude 4.4 quake struck on December 9, affecting the Yasawa Islands and parts of the Western Division, including Lautoka. The second felt tremor was more powerful, reaching magnitude 5.7 on December 19, with vibrations felt in Vanua Levu and neighboring islands. Following this tremor, a series of aftershocks ensued, the most substantial of which registered at 4.4.
The Seismology Unit offered insights into the seismic patterns observed, noting an increase in shallow earthquakes particularly in the northern regions of Fiji, around Vanua Levu. This activity spanned from the Yasawas to Cikobia Island along the Fiji Fracture Zone. The unit confirmed that this level of seismic activity is normal for the area, attributed to its geological characteristics.
Moreover, deeper earthquakes were detected at depths ranging from 300 to 600 kilometers, predominantly to the east of Fiji, below the Lau Basin. This occurrence underscores the ongoing subduction processes where the Pacific Plate is driven beneath the Indo-Australian Plate.
Minor seismic activity was also recorded around Kadavu Island, southeast Viti Levu, and closer to Savusavu Bay on Vanua Levu. Additionally, on December 7, a brief episode of earthquakes occurred near Naigani Island in Tailevu Province, with the strongest measuring 2.5; however, this swarm did not produce any felt reports.
The Fiji Seismology Unit reassured the community that such seismic levels are typical for the region, given Fiji’s location along active tectonic boundaries. They encouraged residents to stay informed and prepared by following official updates, highlighting the importance of readiness for natural events in this seismically active area. The ongoing awareness and preparedness will help residents protect themselves and respond effectively to any future seismic events.