M 6.3 Off-shore on 31 May 2023 02:21 UTC

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: 6.3M
Depth: 9.848 Km
Event Date: 31 May 2023 02:21 UTC
31 May 2023 13:21 Local
Exposed Population:
Source: NEIC us7000k54z
Inserted at: 31 May 2023 14:34 UTC
INFORM Coping capacity of the alert score:
1.1 ()

GDACS Score

For more info on GDACS alert score click here.
  Earthquake
(Shakemap)		 Tsunami GDACS score
NEIC 0 0 0
us7000k54z Scaled population (vector) 0 Max wave alert 0m  
  C1 shakemap -0.59 Max wave realtime 0m  
  C2 shakemap 0.53      
  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
1508440 0 31 May 2023 02:21 6.2M, 5km 6.88 No people affected (in 100km) 0m (at 00:00) 00:20 NEIC
1508517 0 31 May 2023 02:21 6.3M, 9.848km 3.43 N/A (in MMI>=VII) 0m (at 00:00) 12:13 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: ""Auckland Islands""

Fault parameters

  • Latitude: -49.631
  • Longitude: 163.817
  • Length: 22 km
  • Width: 6 km
  • Magnitude: 6.3 M

Okada parameters:

  • Slip: .6 m
  • Strike: 23 (geogr angle: north=0, south=180)
  • Dip: 15 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): 162.317, -51.131, 165.317, -48.131
  • 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.