In the South Pacific Ocean 138 kilometer from Nuku‘alofa, Tonga, a shallow and significant M5.1 earthquake occurred in the morning of Wednesday April 30th, 2025.
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Earthquake Summary
This earthquake hit under water in the South Pacific Ocean, 131 kilometers (81 mi) off the coast of Tonga, 138 kilometer east-northeast of Nuku‘alofa in Tongatapu. The center of this earthquake had a very shallow depth of 10 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.
| Date and Time: | Apr 30, 2025 08:16AM (Tongatapu Time) - Apr 29, 2025 19:16 Universal Time. |
|---|---|
| Location: | 138 km ENE of Nuku‘alofa, Tongatapu, Tonga. Coordinates 20°52'27"S 173°54'14"W. |
| Map: |  Map of area around epicenter. Click to open in Google Maps. |
| Magnitude: | MAG 5.1 Detected by 108 stations. Maximum Error Range ±0.055 . |
| Depth: | 10 km (6 mi) A very shallow depth. |
| Tsunami Risk: | Low tsunami risk Earthquakes under MAG-6.5 do not usually cause tsunami's. Always stay cautious - More info here. |
Nearby towns and cities
This earthquake may have been felt in Tonga . Located 138 kilometer (86 mi) east-northeast of the epicenter of this earthquake, Nuku‘alofa (Tongatapu, Tonga) is the nearest significant population center.
Overview of nearby places
| Distance | Place |
|---|---|
| 138 km (86 mi) WSW from epicenter |
Nuku‘alofa Tongatapu, Tonga. |
Aftershocks detected
In the days before this main shock, 1 smaller foreshock was detected. Nearby this earthquake a foreshock struck 55 mins earlier. It measured a magnitude of 4.3
Overview of foreshocks and aftershocks
| Classification | Magnitude | When | Where |
|---|---|---|---|
| Foreshock | M 4.3 |
55 mins earlier Apr 30, 2025 07:21AM (Tongatapu Time) | 95 km (59 mi) NE from Main Shock. |
| Main Shock This Earthquake |
M 5.1 |
Apr 30, 2025 08:16AM (Tongatapu Time) | - |
More earthquakes coming?
Aftershocks are usually at least 1 order of magnitude less strong than main shocks. The more time passes, the smaller the chance and likely strength of any potential aftershocks.
The chance that a significant earthquake like this one is followed by an even larger earthquake is not so large. On average, scientists estimate a 94% chance that a major earthquake will not be followed by an even larger one. It is still adviced to be aware of this risk
Read: How to Stay Safe during an Earthquake (cdc.gov).Earthquakes like this happen often in the region
Earthquakes of this strength are very common in the region. This is the strongest earthquake to hit since March 30th, 2025, when a 5.2 magnitude earthquake hit 65 km (41 mi) further north. An even stronger magnitude 7.3 earthquake struck on November 11th, 2022.
In total, 230 earthquakes with a magnitude of 5.1 or higher have been registered within 300km (186 mi) of this epicenter in the past 10 years. This comes down to an average of once every 16 days.
Low tsunami risk
Based on early data it appears this earthquake was not strong enough (lower than MAG-6.5) to be likely to cause destructive tsunami's. However this earthquake appeared to have hit at a shallow depth under sea, so stay cautious and monitor advice from local authorities.
Tsunami Risk Factors
| Factor | Under Sea? | MAG-6.5 or stronger? | Shallow depth? |
|---|---|---|---|
| Explanation | Almost all tsunami's are caused by earthquakes with their epicenter under sea or very near the sea. However stay cautious in coastal areas as earthquakes on land may cause landslides into sea, potentially still causing a local tsunami. | Under MAG 6.5: Very unlikely to cause a tsunami. MAG 6.5 to 7.5: Destructive tsunami's do occur, but are uncommon. Likely to observe small sea level changes. MAG 7.6+: Earthquakes with these magnitudes might produce destructive tsunami's. |
Most destructive tsunami's are caused by shallow earthquakes with a depth between 0 and 100km under the surface of the earth. Deeper tsunami's are unlikely to displace to ocean floor. |
| This Earthquake | This earthquake appears to have struck under the sea. | Not this earthquake. This earthquake had a magnitude of 5.1. Earthquakes of this strength are unlikely to trigger a tsunami. |
This earthquake occurred at a depth of of 10 km (6 mi). Earthquakes this shallow could trigger a tsunami. |
Sources
Last updated 19/05/25 21:58 (). This article is automatically generated based on available data. We keep checking multiple sources for additional information. This article gets updated as new details on this earthquake become available.
- US Geographic Society (USGS): Earthquake us7000pvxz
- European-Mediterranean Seismological Centre (EMSC): Earthquake 20250429_0000275
- Geonames.org: World Cities Database
- Google Maps: Static API
- Earthquakelist.org: Historic Earthquakes Database
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