M 6.6 in Tonga on 26 May 2024 20:47 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: 6.6M
Depth: 112.2 Km
Event Date: 26 May 2024 20:47 UTC
26 May 2024 08:47 Local
Exposed Population: 2 thousand in MMI VI
Source: NEIC us6000n158
Inserted at: 26 May 2024 21:05 UTC
INFORM Coping capacity of the alert score:
1.1 (Tonga)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us6000n158 Scaled population (raster) 0.3 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0m  
  C2 shakemap 0.53      
  Country Vulnerability 0      
  INFORM_normalised 0.94      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1573253 0 26 May 2024 20:47 6.6M, 157.1km N/A 10 thousand (in 100km) 0m (at 00:00) 00:08 PTWC
1573256 0 26 May 2024 20:47 6.6M, 163km N/A 6 thousand (in 100km) 0m (at 00:00) 00:13 NTWC
1573258 0 26 May 2024 20:47 6.6M, 112.2km 6.31 N/A (in MMI>=VII) 0m (at 00:00) 00:17 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.

Tsunami affected locations

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

See full locations list (RSS)


Initial conditions

Title: ""M 6.6, 70 km NW of Fangale’ounga, Tonga""

Fault parameters

  • Latitude: -19.377
  • Longitude: -174.869
  • Length: 31 km
  • Width: 8 km
  • Magnitude: 6.6 M

Okada parameters:

  • Slip: .9 m
  • Strike: 200 (geogr angle: north=0, south=180)
  • Dip: 33 degree
  • Rake: 90 degree
  • Depth: 112 km

Calculation parameters

  • Calculation space (lon/lat): -176.369, -20.877, -173.369, -17.877
  • Instead of Step -> use Cell size:.25 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.