M 6.5 Off-shore on 27 Apr 2024 08:35 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: 6.5M
Depth: 503.2 Km
Event Date: 27 Apr 2024 08:35 UTC
27 Apr 2024 17:35 Local
Exposed Population:
Source: NEIC us6000mu8k
Inserted at: 27 Apr 2024 08:47 UTC
INFORM Coping capacity of the alert score:
1.1 ()


For more info on GDACS alert score click here.
(Rapid Impact)
Tsunami GDACS score
NEIC 0 0 0
us6000mu8k 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
1567605 0 27 Apr 2024 08:35 6.5M, 503.2km 2.85 No people affected (in 100km) 0m (at 00:00) 00:12 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: ""Bonin Islands""

Fault parameters

  • Latitude: 27.826
  • Longitude: 139.57
  • Length: 28 km
  • Width: 7 km
  • Magnitude: 6.5 M

Okada parameters:

  • Slip: .8 m
  • Strike: 90 (geogr angle: north=0, south=180)
  • Dip: 45 degree
  • Rake: 90 degree
  • Depth: 503 km

Calculation parameters

  • Calculation space (lon/lat): 138.07, 26.326, 141.07, 29.326
  • 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.