M 6.4 Off-shore on 03 Apr 2021 01:16 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: 6.4M
Depth: 10 Km
Event Date: 03 Apr 2021 01:16 UTC
03 Apr 2021 00:16 Local
Exposed Population: No people within 100km
Source: NEIC us6000dynd
Inserted at: 03 Apr 2021 01:37 UTC
INFORM Coping capacity of the alert score: 1.1 ()


For more info on GDACS alert score click here.
  Earthquake Tsunami GDACS score
NEIC 0 0 0
us6000dynd Scaled population (vector) 0 Max wave alert 0m  
  C1 earthquake 1 Max wave realtime 0m  
  C2 earthquake 0      
  Country Vulnerability 0      
  INFORM_normalised 1      
Maximum expected impact using different data sources.
Click on image to zoom it.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1368325 0 03 Apr 2021 01:16 6.4M, 10km N/A No people affected (in 100km) 0m (at 00:00) 00:20 NEIC
1368330 0 03 Apr 2021 01:16 6.6M, 10km N/A No people affected (in 100km) 0m (at 00:00) 00:41 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

See full locations list (RSS)

Initial conditions

Title: ""east of the South Sandwich Islands""

Fault parameters

  • Length: 25 km
  • Width: 7 km
  • Magnitude: 6.4 M

Okada parameters:

  • Slip: .6 m
  • Strike: 63 (geogr angle: north=0, south=180)
  • Dip: 45 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): -9.36, -59.478, -6.36, -56.478
  • 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.