M 7 in Tonga on 30 Mar 2025 12:18 UTC

Hazard models

Rapid Impact
Shakemap
Tsunami

Event summary

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

Earthquake Magnitude: 7.0M
Depth: 29 Km
Event Date: 30 Mar 2025 12:18 UTC
30 Mar 2025 00:18 Local
Exposed Population: 5 thousand in MMI VI
Source: NEIC us7000pntq
Inserted at: 30 Mar 2025 16:13 UTC
INFORM Coping capacity of the alert score:
1.1 (Tonga)
Maximun Wave Height observed: 0.05 m

GDACS Score

For more info on GDACS score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us7000pntq Scaled population (raster) 0 Max wave alert 0m  
  C1 shakemap 0 Max wave realtime 0.05m  
  C2 shakemap 0      
  Country Vulnerability 0      
  INFORM_normalised 0      
Maximum expected impact using different data sources.
Click on images to zoom it.

Episode Timeline

IDLevelScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1630995 0 30 Mar 2025 12:18 7.3M, 58.6km N/A 5 thousand (in 100km) 0m (at 00:00) 00:09 PTWC
1630997 0 30 Mar 2025 12:18 7.3M, 55km N/A 5 thousand (in 100km) 0.1m (at 00:22) 00:11 NTWC
1630998 0.1 30 Mar 2025 12:18 7.1M, 10km 5.83 N/A (in MMI>=VII) 0.1m (at 01:04) 00:15 NEIC
1631002 0.1 30 Mar 2025 12:18 7M, 10km 5.95 N/A (in MMI>=VII) 0.1m (at 00:46) 01:13 NEIC
1631035 0 30 Mar 2025 12:18 7M, 29km 6.12 N/A (in MMI>=VII) 0.1m (at 00:00) 03:55 NEIC
The episode that generated the alert; the next major evaluations beyond 12 hours will not trigger additional alerts.
The episode that has the last updated information.
* The max MMI detected for sources having shakemaps;
** The population detected in MMI>=7 for episode with shakemap or in a 100km radius;
*** The tsunami max height.

Estimated Tsunami affected locations

The maximum observed wave height is 0.05m in Alofi Nu;

Level Date (UTC) Name Country Wave height (m)

See full locations list (RSS)


Initial conditions

Title: ""73 km SE of Pangai""

Fault parameters

  • Latitude: -20.329
  • Longitude: -173.907
  • Length: 50 km
  • Width: 14 km
  • Magnitude: 7 M

Okada parameters:

  • Slip: 1.3 m
  • Strike: 206 (geogr angle: north=0, south=180)
  • Dip: 18 degree
  • Rake: 90 degree
  • Depth: 29 km

Calculation parameters

  • Calculation space (lon/lat): -178.407, -24.829, -169.407, -15.829
  • Instead of Step -> use Cell size:.75 minutes

Sea Level

More information

  • Timeline:
    Tsunami calculations performed to this case, click here

  • Montecarlo:
    Tsunami Montecarlo simulation performed to this case, click here

For a full list of available products related to this event, please refer to the GDACS Resources page.