M 6.3 in Indonesia on 23 Feb 2023 20:02 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: 6.3M
Depth: 97.145 Km
Event Date: 23 Feb 2023 20:02 UTC
24 Feb 2023 05:02 Local
Exposed Population: 2 thousand in MMI V
Source: NEIC us6000jr32
Inserted at: 23 Feb 2023 20:20 UTC
INFORM Coping capacity of the alert score:
1.1 (Indonesia)


For more info on GDACS alert score click here.
Tsunami GDACS score
NEIC 0 0 0
us6000jr32 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
1491743 0 23 Feb 2023 20:02 6.3M, 97.145km 4.57 less than 100 (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: ""177 km N of Tobelo""

Fault parameters

  • Latitude: 3.324
  • Longitude: 128.15
  • Length: 22 km
  • Width: 6 km
  • Magnitude: 6.3 M

Okada parameters:

  • Slip: .6 m
  • Strike: 151 (geogr angle: north=0, south=180)
  • Dip: 46 degree
  • Rake: 90 degree
  • Depth: 97 km

Calculation parameters

  • Calculation space (lon/lat): 126.65, 1.824, 129.65, 4.824
  • 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.