M 6.9 in Samoa Islands Region from 04 Dec 2022 19:24 UTC to 19:24

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: 6.9M
Depth: 148 Km
Event Date: 04 Dec 2022 19:24 UTC
04 Dec 2022 08:24 Local
Exposed Population: 1 thousand in MMI&>=IV
Source: NTWC at00rmdskr
Inserted at: 04 Dec 2022 19:37 UTC
INFORM Coping capacity of the alert score:
1.1 ()

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Rapid Impact)		 Tsunami GDACS score
NTWC 0 0 0
at00rmdskr Scaled population (vector) 0 Max wave alert 0m  
  C1 rapid impact 0 Max wave realtime 0m  
  C2 rapid impact 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
1476910 0.1 04 Dec 2022 19:24 6.9M, 33km N/A 1 thousand (in 100km) 0.2m (at 00:17) 00:08 PTWC
1476912 0 04 Dec 2022 19:24 6.9M, 148km N/A 1 thousand (in 100km) 0m (at 00:00) 00:13 NTWC
1476914 0 04 Dec 2022 19:24 6.7M, 35.999km 4.83 N/A (in MMI>=VII) 0m (at 00:00) 00:19 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 6.9, 141 km ENE of Hihifo, Tonga""

Fault parameters

  • Latitude: -15.7
  • Longitude: -172.5
  • Length: 44 km
  • Width: 12 km
  • Magnitude: 6.9 M

Okada parameters:

  • Slip: 1.2 m
  • Strike: 149 (geogr angle: north=0, south=180)
  • Dip: 8 degree
  • Rake: 90 degree
  • Depth: 148 km

Calculation parameters

  • Calculation space (lon/lat): -175.5, -18.7, -169.5, -12.7
  • Instead of Step -> use Cell size:.5 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.