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M5.0 Earthquake near ‘Ohonua, Tonga — 03 September 2025

A moderate earthquake of magnitude 5.0 was recorded near ‘Ohonua, Tonga on , with an epicentre 246 km south-southwest of ‘Ohonua, at a focal depth of 45.1 km. It ranked as the 9th strongest of 21 earthquakes recorded in Tonga in the preceding 30 days.

5.0 Moderate

Time (UTC): 2025-09-03 22:56:12

Time (your timezone): —

Magnitude: 5.0 (moderate)

Focal depth: 45.1 km (shallow)

Epicentre: -23.4820, -175.6200

Location: 246 km SSW of ‘Ohonua, Tonga

Country: Tonga

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area.

A magnitude 5.0 earthquake radiates roughly 477 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 385, which is below the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.

What the magnitude scale actually measures →

When it happened locally

That is about 11:13 local solar time at the epicentre, during the morning.

This event was shallower than 63% of the 401 earthquakes recorded in Tonga in our catalogue and stronger than 69% of them.

Where was the epicentre?

The epicentre was located at -23.4820, -175.6200 — 246 km south-southwest of ‘Ohonua. The closest other recorded event was a magnitude 4.9 earthquake 14 km southwest of here on 22 June 2026.

The nearest other settlement in our records is Houma (145 km west).

Why the 45 km depth matters

At 45 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size can be felt widely and may cause minor local damage. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.

Read more on how focal depth changes what you feel →

What does the tsunami information flag mean?

The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M5.0 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.

How earthquakes generate tsunamis, and what the alert levels mean →

Aftershocks and local seismic history

1 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 5.0.

99 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.0 event near ‘Ohonua on 25 May 2025. This M5.0 event released about 32 times less energy than that event.

16 earthquakes have been recorded within 100 km of this epicentre in the past year, 0 of them in the past 30 days.

How long aftershock sequences last, and how large they get →

Where this event sits in the record

This earthquake is part of the September 2025 worldwide record, and of earthquakes in Tonga during September 2025. Browse the full monthly archive to compare periods.

Nearest recorded earthquakes to this epicentre

Other recent earthquakes in Tonga

All recorded earthquakes in Tonga →

Other magnitude 5 earthquakes worldwide

All magnitude 5 earthquakes →

Questions about this earthquake

How strong was the earthquake near ‘Ohonua?

It measured magnitude 5.0 — a moderate earthquake. A magnitude 5.0 earthquake radiates roughly 477 tons of TNT equivalent in seismic energy.

How deep was the earthquake near ‘Ohonua?

The focus was 45 km below the surface, which counts as shallow.

Was the ‘Ohonua earthquake felt at the surface?

At magnitude 5.0 and a focal depth of 45 km, shaking would have been concentrated near the epicentre.

When did the earthquake near ‘Ohonua happen?

03 September 2025 at 22:56 UTC.

Was there a tsunami?

No. The USGS record carries no tsunami-information link for this event.

Have there been aftershocks?

1 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 5.0.

How often do earthquakes happen near ‘Ohonua?

99 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.0 event near ‘Ohonua on 25 May 2025. This M5.0 event released about 32 times less energy than that event.