Major magnitude 8.1 earthquake - Kermadec Islands, New Zealand, on Thursday, 4 March 2021 at 19:28 (GMT) - information

Terremoto maggiore magnitudine 8.1 - South Pacific Ocean, Nuova Zelanda, giovedí, 04 marzo 2021

- Terremoto maggiore magnitudine 8.1 - South Pacific Ocean, Nuova Zelanda, giovedí, 04 marzo 2021

Terremoto maggiore magnitudine 8.1 at 27 km depth

4 Mar 19:36 UTC: Primo a segnalare: GEONET (NZ) dopo 8 minuti.
4 Mar 19:43: Magnitudine ricalcolata da 7.0 a 7.1. Posizione dell'epicentro corretta di 99 km (62 mi) al SO.
... [show all] ...
5 Mar 18:10: Profondità ricalcolata da 19.4 a 26.5 km (da 12.1 a 16.5 mi). Posizione dell'epicentro corretta di 1.5 km (0.9 mi) al WNW.
Update Fri, 5 Mar 2021, 12:06
Source changed to USGS
As most agencies put the quake magnitude close to 8, while only Geonet only lists it as a much lower magnitude 7.1 event, we decided to trust USGS as primary data source with a magnitude of 8.1.
Update Fri, 5 Mar 2021, 02:05
Tsunami warning raised again after third powerful earthquake hit off the coast of North Island, NZ
A third powerful earthquake hit off the coast of North Island, New Zealand on Friday, 5 March 2021, 7:28 am local time. This magnitude 8.1 quake occurred near the Kermadec Islands about 880 km north of New Zealand, at a depth of 20-24 km.
Although this quake was not felt much in the nearby North Island, the New Zealand National Emergency Management Agency urged people in some areas to head for higher ground. A tsunami warning was raised over several coastal areas of both North and South Island, New Zealand.

The warning was lifted later that day, at around 1:40 pm local time. According to the latest tsunami threat message from the Pacific Tsunami Warning Center, tsunami waves were measured as far as the French Polynesia more than 3000 km northeast of the earthquake's epicenter. The northern coast of New Zealand's North Island was hit by tsunami waves of about 0.16 meters high, i.e., only 16 centimeters. The areas hit include the coasts from North Cape to East Cape.
No significant damage has been reported.

According to the United States Geological Survey (USGS ), the earthquake resulted from a reverse faulting in the Tonga-Kermadec subduction zone at a depth of about 22 km. USGS was also able to identify the earlier 7.4 quake as a foreshock preceding this quake by nearly 2 hours. The first of the three major earthquakes, which occurred 6 hours prior the second quake, did not directly cause the second and third quakes.
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Earthquake data:

Data & ora: 4 Mar 2021 19:28:32 UTC -
Ora locale a epicentro: Thursday, 4 Mar 2021 07:28 (GMT -12)
Magnitudine: 8.1
Profondità: 26.5 km
Epicentro latitudine / longitudine: 29.7347°S / 177.2817°W (South Pacific Ocean, Nuova Zelanda)
Vulcano più vicino: Raoul Island (239 km / 149 mi)
Fonte dati primaria: USGS (United States Geological Survey)
Stima dell'energia sismica liberata: 8.9 x 1016 joules (24757 gigawatt hours, equivalent to 2.1 x 107 tons of TNT or 1331.3 atomic bombs!) More info
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.ProfonditàUbicazioneFonte
8.127 kmKermadec Islands, New ZealandUSGS
7.110 kmNew ZealandGEONET (NZ)
7.923 kmKermadec Islands, New ZealandGeoAu
8.125 kmKERMADEC ISLANDS, NEW ZEALANDEMSC
7.81.6 kmNew Zealand [Sea]INGV
8.024 kmKermadec Islands, New ZealandGFZ
7.824 kmKermadec Islands, New ZealandBMKG

User reports for this quake (30)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Waiau Pa near Clark's beach / Very weak shaking (MMI II) / vibration and rolling : Was laying on my tummy on a mattress,working an awake shift, felt like currents of waves from the floor and the glass doors shook abit | 18 users found this interesting.  
3001.3 km WSW of epicenter [Map] / not felt : Not felt but worried about a potential mega thrust earthquake . | 15 users found this interesting. (reported through our app)  
1075.3 km SW of epicenter [Map] / not felt : Could hear the rumble of the ground as the dogs in the town making a noise sounded like thunder but a blue sky above | 11 users found this interesting. (reported through our app)  
Mt eden Auckland / Light shaking (MMI IV) / rattling, vibrating / very short : I was woken up by a light shake - it felt as if someone was rocking my bed lightly trying to put me to sleep. I got up and looked at my bubs cot trying to spot his cot hanging toys movement but due to not enough light i couldnt see that properly. | 6 users found this interesting.  
1017.5 km SW of epicenter [Map] / not felt : Nothing felt in Kerikeri, Bay of Islands, Northland New Zealand | 4 users found this interesting. (reported through our app)  
Iran / Weak shaking (MMI III) : Hello, we are watching earthquakes and volcanoes all over the world and we have been waiting for it | 6 users found this interesting.  
  • Did you tell anyone?
Auckland northshore / not felt : Not felt anything | 3 users found this interesting.  
Russia, Sankt Petersburg City,(GMT+3),not felt. / not felt : Oh Much, to my appartament not felt event earthquake, please stsy sayf all. | 4 users found this interesting.  
11822.9 km ENE of epicenter [Map] / Weak shaking (MMI III)
Vrindavn, Mathura (1.1 km NNE of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating
1125.6 km SW of epicenter [Map] / not felt (reported through our app)
8378.8 km WNW of epicenter [Map] / not felt
1214.3 km SSW of epicenter [Map] / Severe shaking (MMI VIII) / horizontal (sideways) swinging (reported through our app)
TAUPO NEW ZEALAND (1171 km SSW of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
3024.7 km WSW of epicenter [Map] / not felt (reported through our app)
Rangiora, NZ (1785.2 km SSW of epicenter) [Map] / Moderate shaking (MMI V)
Mortlake vic Aus (3768.7 km WSW of epicenter) [Map] / not felt (reported through our app)
1776.9 km SSW of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
Flat Bush (1081.7 km SW of epicenter) [Map] / not felt
Esperance (5684 km WSW of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s : Light wobble when I was in bed | One user found this interesting.  
Kermadec Islands, New Zealand / not felt
Greece / Very weak shaking (MMI II)
Orewa / Light shaking (MMI IV) / rattling, vibrating
Atlanta / not felt
Wanganui / not felt
Tauranga / not felt
Plamerston north / Moderate shaking (MMI V)
Christchurch / not felt
does it matter / Violent shaking (MMI IX)
Tauranga / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s
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Aftershocks

More info
Recorded aftershocks, latest first (566 quakes):
  • 12 Jun 2021 19:28 UTC
    | M 4.3 |
    484.5 km (301.1 mi) depth
    |
    442 km (275 mi) distance
    | GEONET (NZ) | Details
  • 12 Jun 2021 15:52 UTC
    | M 4.9 |
    284.3 km (176.7 mi) depth
    |
    162 km (101 mi) distance
    | GEONET (NZ) | Details
  • 12 Jun 2021 12:17 UTC
    | M 4.3 |
    713.8 km (443.5 mi) depth
    |
    385 km (239 mi) distance
    | GEONET (NZ) | Details
  • 11 Jun 2021 16:48 UTC
    | M 4.1 |
    33 km (20.5 mi) depth
    |
    424 km (263 mi) distance
    | GEONET (NZ) | Details
  • 11 Jun 2021 11:51 UTC
    | M 4.0 |
    466.8 km (290.1 mi) depth
    |
    364 km (226 mi) distance
    | GEONET (NZ) | Details
  • 11 Jun 2021 08:13 UTC
    | M 4.2 |
    196.2 km (121.9 mi) depth
    |
    425 km (264 mi) distance
    | GEONET (NZ) | Details
  • 11 Jun 2021 07:26 UTC
    | M 4.4 |
    734.7 km (456.5 mi) depth
    |
    363 km (226 mi) distance
    | GEONET (NZ) | Details
  • 11 Jun 2021 04:32 UTC
    | M 4.0 |
    270.6 km (168.1 mi) depth
    |
    570 km (354 mi) distance
    | GEONET (NZ) | Details
  • 10 Jun 2021 15:48 UTC
    | M 4.8 |
    337.6 km (209.8 mi) depth
    |
    389 km (242 mi) distance
    | GEONET (NZ) | Details
  • 10 Jun 2021 02:34 UTC
    | M 4.3 |
    115 km (71.5 mi) depth
    |
    331 km (206 mi) distance
    | GEONET (NZ) | Details
  • 09 Jun 2021 18:53 UTC
    | M 4.7 |
    377.6 km (234.6 mi) depth
    |
    434 km (270 mi) distance
    | GEONET (NZ) | Details
  • 09 Jun 2021 17:04 UTC
    | M 4.1 |
    200 km (124.3 mi) depth
    |
    496 km (308 mi) distance
    | GEONET (NZ) | Details
  • 09 Jun 2021 16:37 UTC
    | M 4.5 |
    12 km (7.5 mi) depth
    |
    218 km (135 mi) distance
    | GEONET (NZ) | Details
  • 09 Jun 2021 14:00 UTC
    | M 4.5 |
    150 km (93.2 mi) depth
    |
    494 km (307 mi) distance
    | GEONET (NZ) | Details
  • 08 Jun 2021 18:17 UTC
    | M 5.2 |
    176 km (109.4 mi) depth
    |
    250 km (155 mi) distance
    | GEONET (NZ) | Details
  • 08 Jun 2021 18:17 UTC
    | M 4.9 |
    20.7 km (12.9 mi) depth
    |
    347 km (215 mi) distance
    | USGS | Details
  • Show all

Earlier earthquakes in the same area since 1900


Map of earlier quakes

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