A magnitude 5.1 earthquake occurred 48 km northeast of Nuku’alofa at 5:36 am local time on August 11, 2025, according to the Tonga Meteorological Service.
The quake, centred at a depth of 86 km near Nomuka in Ha’apai, prompted immediate evaluation but was determined to pose no tsunami threat to the island nation.
The National Tsunami Warning Centre confirmed this assessment in its final advisory, noting the provisional magnitude could be revised as more data becomes available.
Authorities emphasised that only official warnings from the Tonga Meteorological Service should be considered definitive for tsunami alerts.
Residents across Tonga reported feeling tremors on Monday morning at around 4.40am (Tonga time), on social media.
“Earthquake Tonga,” a commenter wrote.
“Earthquake on the move,” another wrote.
Last month, two earthquakes were reportedly felt in the kingdom.
An 8.8-magnitude earthquake near Russia’s coast triggered tsunami waves that reached Tonga’s remote Niua islands.
No damage or injuries from the Russian quake’s waves have been confirmed in Tonga.
The following day, a magnitude 5.2 earthquake struck Tonga at approximately 2.34pm local time.
According to seismic data, that quake occurred at a depth of 14 kilometres, with its epicentre located 80 kilometres east of Nukuʻalofa, the capital of Tonga.
