Earthquake.now

M4.5 Earthquake near Hihifo, Tonga — 28 July 2026

A light earthquake of magnitude 4.5 was recorded near Hihifo, Tonga on , with an epicentre 92 km south of Hihifo, at a focal depth of 123.2 km. It ranked as the 14th strongest of 22 earthquakes recorded in Tonga in the preceding 30 days.

4.5 Light

Time (UTC): 2026-07-28 19:25:41

Time (your timezone): —

Magnitude: 4.5 (light)

Focal depth: 123.2 km (intermediate)

Epicentre: -16.7774, -173.6420

Location: 92 km S of Hihifo, Tonga

Country: Tonga

USGS link to NOAA tsunami information: Not linked

Review status: Reviewed

Source: USGS event page

How strong was this earthquake?

Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items.

A magnitude 4.5 earthquake radiates roughly 85 tons of TNT equivalent in seismic energy.

The USGS assigns this earthquake a significance score of 312, 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 07:51 local solar time at the epicentre, around dawn.

This event was shallower than 51% of the 401 earthquakes recorded in Tonga in our catalogue and stronger than 20% of them.

Where was the epicentre?

The epicentre was located at -16.7774, -173.6420 — 92 km south of Hihifo. The closest other recorded event was a magnitude 5.3 earthquake 23 km east of here on 10 May 2026.

The nearest other settlements in our records are Lotofagā (216 km northeast), Gataivai (218 km north-northeast), Neiafu (239 km south-southeast) and Mata-Utu (289 km northwest).

Why the 123 km depth matters

At 123 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.

This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its intermediate depth normally reduces peak shaking near the epicentre compared with a shallow 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 M4.5 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; its 123 km focal depth is too great to deform the sea floor significantly; 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 5.4.

179 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 7.5 event near Neiafu on 24 March 2026. This M4.5 event released about 31,623 times less energy than that event.

26 earthquakes have been recorded within 100 km of this epicentre in the past year, 2 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 July 2026 worldwide record, and of earthquakes in Tonga during July 2026. 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 4 earthquakes worldwide

All magnitude 4 earthquakes →

Questions about this earthquake

How strong was the earthquake near Hihifo?

It measured magnitude 4.5 — a light earthquake. A magnitude 4.5 earthquake radiates roughly 85 tons of TNT equivalent in seismic energy.

How deep was the earthquake near Hihifo?

The focus was 123 km below the surface, which counts as intermediate.

Was the Hihifo earthquake felt at the surface?

At magnitude 4.5 and a focal depth of 123 km, the depth spreads the energy out, so shaking is weaker overhead but reaches further.

When did the earthquake near Hihifo happen?

28 July 2026 at 19:25 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 5.4.

How often do earthquakes happen near Hihifo?

179 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 7.5 event near Neiafu on 24 March 2026. This M4.5 event released about 31,623 times less energy than that event.