M 4.6 in New Zealand on 31 Dec 2021 06:37 UTC

Hazard models

EQ parameters
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: 4.6M
Depth: 57.29 Km
Lat/Lon: -37.3749 , 177.7688
Event Date: 31 Dec 2021 06:37 UTC
31 Dec 2021 19:37 Local
Exposed Population:
30 thousand in 100km
Source: NEIC us7000g84j
Inserted at: 31 Dec 2021 06:55 UTC
INFORM Coping capacity of the alert score
2 (New Zealand)

GDACS Score

For more info on GDACS alert score click here.
  Earthquake GDACS score
NEIC 0 0
us7000g84j Scaled population (vector) 3.86  
  C1 earthquake 1  
  C2 earthquake 0  
  Country Vulnerability -0.33  
  INFORM_normalised 0.63  
Maximum expected impact using different data sources.

Episode Timeline

IDAlertScoreDateMag, DepthMMI*Population**Tsunami risk***Delay (hh:mm)Source
1418913 0 31 Dec 2021 06:37 4.6M, 57.29km N/A 30 thousand (in 100km) 00:18 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.

Exposed population

The earthquake happened in New Zealand , County of East Cape. The nearest places are Cape Runaway, Waihau Bay, Whangaparaoa, Raukokore, Te Kaha, Omaio, Hicks Bay, Houpoto, Pakihiroa, Te Araroa, and Horoera.

Radius Population
100 km 33000 people
75 km 4100 people
50 km 1500 people
20 km no people
10 km no people
5 km no people
2 km no people

Affected Provinces

Region Province Country Population
East Cape New Zealand -
Bay of Plenty New Zealand -
Hawke's Bay New Zealand -
Waikato New Zealand 39000 people
Auckland New Zealand 320000 people
Wanganui-Manawatu New Zealand -
Taranaki New Zealand -
Northland New Zealand -
Wellington New Zealand 150000 people
Nelson-Marlborough New Zealand -

Affected populated places

Name Region Province Country City class Population Distance
Cape Runaway Bay of Plenty New Zealand Village - 27 km
Waihau Bay Bay of Plenty New Zealand Village - 30 km
Whangaparaoa Bay of Plenty New Zealand Village - 30 km
Raukokore Bay of Plenty New Zealand Village - 31 km
Te Kaha Bay of Plenty New Zealand Village <1000 people 41 km
Omaio Bay of Plenty New Zealand Village - 50 km
Hicks Bay Gisborne New Zealand Village - 53 km
Houpoto Bay of Plenty New Zealand Village - 58 km
Pakihiroa Gisborne New Zealand Village - 59 km
Te Araroa Gisborne New Zealand Village - 60 km
Whakaangiangi Gisborne New Zealand Village - 61 km
Torere Bay of Plenty New Zealand Village - 68 km
Horoera Gisborne New Zealand Village - 68 km

see full list

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Name IATA Code Elevation (m) Usage Runway type IFR Runway Length (ft) Distance
Opotiki 8 Civ. Unpaved No 3400 83 km
Whakatane WHK 6 Civ. Paved Yes 4100 97 km

Ports

Name LOCODE Country Distance
East Cape New Zealand 78 km
Opotiki New Zealand 79 km
Whakatane New Zealand 93 km
Tokomaru New Zealand 97 km

More information

For a full list of available products related to this event, please refer to the GDACS Resources page.