M 6.6 in Tonga on 01 Oct 2024 20:05 UTC

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: 10 Km
Event Date: 01 Oct 2024 20:05 UTC
01 Oct 2024 08:05 Local
Exposed Population: 10 thousand in MMI IV
Source: NEIC us7000nhjw
Inserted at: 01 Oct 2024 21:00 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
us7000nhjw Scaled population (raster) 0 Max wave alert 0m  
  C1 shakemap 0 Max wave realtime 0m  
  C2 shakemap 0      
  Country Vulnerability 0      
  INFORM_normalised 0      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1596048 0.1 01 Oct 2024 20:05 6.8M, 10km N/A 20 thousand (in 100km) 0.2m (at 00:24) 00:06 PTWC
1596049 0 01 Oct 2024 20:05 6.8M, 10km 4.22 10 thousand (in 100km) 0.1m (at 00:24) 00:08 NTWC
1596055 0 01 Oct 2024 20:05 6.6M, 10km 4.38 N/A (in MMI>=VII) 0m (at 00:00) 00:13 NEIC
1596065 0 01 Oct 2024 20:05 6.6M, 10km 4.77 N/A (in MMI>=VII) 0m (at 00:00) 00:54 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: ""154 km ESE of Neiafu""

Fault parameters

  • Latitude: -19.345
  • Longitude: -172.712
  • Length: 31 km
  • Width: 8 km
  • Magnitude: 6.6 M

Okada parameters:

  • Slip: .9 m
  • Strike: 193 (geogr angle: north=0, south=180)
  • Dip: 19 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): -174.212, -20.845, -171.212, -17.845
  • 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.