M 6.3 in Southeast Of Honshu, Japan on 16 Jan 2023 04:49 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: 409.088 Km
Event Date: 16 Jan 2023 04:49 UTC
16 Jan 2023 13:49 Local
Exposed Population:
Source: NEIC us7000j4mj
Inserted at: 16 Jan 2023 05:04 UTC
INFORM Coping capacity of the alert score:
1.1 ()


For more info on GDACS alert score click here.
Tsunami GDACS score
NEIC 0 0 0
us7000j4mj 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
1483838 0 16 Jan 2023 04:49 6.3M, 409.088km 3.1 N/A (in MMI>=VII) 0m (at 00:00) 00:14 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: ""Izu Islands""

Fault parameters

  • Latitude: 29.001
  • Longitude: 139.347
  • Length: 22 km
  • Width: 6 km
  • Magnitude: 6.3 M

Okada parameters:

  • Slip: .6 m
  • Strike: 161 (geogr angle: north=0, south=180)
  • Dip: 26 degree
  • Rake: 90 degree
  • Depth: 409 km

Calculation parameters

  • Calculation space (lon/lat): 137.847, 27.501, 140.847, 30.501
  • 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.