M 4.9 in Tonga on 15 Jul 2025 04:27 UTC

Event summary

This earthquake can have a low humanitarian impact based on the magnitude and the affected population and their vulnerability.

GDACS ID EQ 1490211
Earthquake Magnitude: 4.9M
Depth: 10 Km
Lat/Lon: -20.5578 , -174.2122
Event Date: 15 Jul 2025 04:27 UTC
14 Jul 2025 16:27 Local
Exposed Population:
9 thousand in MMI III
Inserted at: 15 Jul 2025 04:45 UTC
INFORM Coping capacity:
1.1 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Rapid Impact)		 GDACS score
NEIC 0 0
us7000qcqx Scaled population (vector) 0  
  C1 rapid impact 0  
  C2 rapid impact 0  
  Country Vulnerability 0  
  INFORM_normalised 0  
Maximum expected impact using different data sources.
Virtual OSOCC
Meteo assessment
Satellite products
Analytical products
Detailed event map. European Union, 2025. Map produced by EC-JRC.
The boundaries and the names shown on this map do not imply official endorsement or acceptance by the European Union.

Updates on volcanic activity (Smithsonian)

Latest media headlines

Strong mag. 5.0 earthquake - South of Tonga on Thursday, Jul 17, 2025,.. 7/17/2025 8:39:00 AM.

Based on data from the past 25 years and our earthquake archive back to 1900, there are about 42 quakes on average per year in the area near the epicenter of this quake (within 100 km/61 mi): Mag. 7 or higher: 0.04 quakes per year (or 1 qu
...(more)
A tsunami warning is in effect along parts of Alaska’s southern coast .. 7/16/2025 9:58:00 PM.

The U.S. Tsunami Center said the warning was in effect from about 40 miles southwest of Homer to Unimak Pass, a distance of about 700 miles. FILE — A tsunami hazard zone sign is displayed near a beach in El Segundo, California, on January
...(more)
A tsunami warning is in effect along parts of Alaska’s southern coast .. 7/16/2025 9:54:00 PM.

The U.S. Tsunami Center said the warning was in effect from about 40 miles southwest of Homer to Unimak Pass, a distance of about 700 miles. FILE — A tsunami hazard zone sign is displayed near a beach in El Segundo, California, on January
...(more)
A tsunami warning is in effect along parts of Alaska’s southern coast .. 7/16/2025 9:53:00 PM.

The U.S. Tsunami Center said the warning was in effect from about 40 miles southwest of Homer to Unimak Pass, a distance of about 700 miles. FILE — A tsunami hazard zone sign is displayed near a beach in El Segundo, California, on January
...(more)

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Estimated casualties (PAGER)

USGS estimates the number of casualties for each earthquake for the Prompt Assessment of Global Earthquakes for Response (PAGER) product.
The graph shows the current fatalities estimate.

Exposed population

Data, images, links, services and documents

For this events, GDACS has links to information from the following sources: EC-JRC (41), (3), NEIC (4), OCHA (1), INGV (1), WMO (1), INFORM (2), USGS (2),