M 7.1 in Kermadec Islands Region from 16 Mar 2023 00:56 UTC to 00:55

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: 7.1M
Depth: 10 Km
Event Date: 16 Mar 2023 00:55 UTC
15 Mar 2023 12:55 Local
Exposed Population:
Source: PTWC pt23075000
Inserted at: 16 Mar 2023 01:05 UTC
INFORM Coping capacity of the alert score:
1.1 ()


For more info on GDACS alert score click here.
(Rapid Impact)
Tsunami GDACS score
PTWC 0 0.6 0.6
pt23075000 Scaled population (vector) 0 Max wave alert 0.65m  
  C1 rapid impact 0 Max wave realtime 0.65m  
  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
1495606 0.6 16 Mar 2023 00:55 7.1M, 10km N/A No people affected (in 100km) 0.7m (at 00:25) 00:09 PTWC
1495610 0.2 16 Mar 2023 00:56 7M, 22.065km 4.6 No people affected (in 100km) 0.2m (at 00:18) 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

The maximum Wave height is  0.7m in Raoul Island Boat Cove, New Zealand. This height is estimated for 16-Mar-2023 01:20:91.

Alert Date (UTC) Name Country Wave height (m)
16-Mar-2023 01:20:91 Raoul Island Boat Cove New Zealand  0.7

See full locations list (RSS)

Initial conditions

Title: ""Kermadec Islands region""

Fault parameters

  • Latitude: -30.233
  • Longitude: -175.85
  • Length: 56 km
  • Width: 15 km
  • Magnitude: 7.1 M

Okada parameters:

  • Slip: 1.5 m
  • Strike: 201 (geogr angle: north=0, south=180)
  • Dip: 25 degree
  • Rake: 90 degree
  • Depth: 10 km

Calculation parameters

  • Calculation space (lon/lat): -180.35, -34.733, -171.35, -25.733
  • Instead of Step -> use Cell size:.75 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.