Magnitude 8.1 earthquake – South Pacific, New Zealand, Thursday, March 4, 2021 7:28 a.m. (GMT -12)

Magnitude 8.1 earthquake – New Zealand on Thursday, March 4, 2021 at 19:28 (GMT) – Information – Magnitude 8.1 earthquake at a depth of 19 km

Mar 4 19:36 UTC: First to report: GEONET (New Zealand) after 8 minutes. Mar 4 19:43: Volume recalculated from 7.0 to 7.1. Epicenter location corrected 99 km (62 mi) toward SW 4 Mar 19:54: Depth of epicenter was recalculated from 12.0 to 10.0 km (7.5 to 6.2 mi). Epicenter location corrected 33 km (20 mi) towards SW 5 Mar 12:04: now with data updates from USGS

Update Friday, March 5, 2021, 12:06

Source changed to USGS

With most agencies placing the earthquake magnitude near 8, while Geonet only lists it as having a much lower magnitude 7.1 event, we decided to trust the U.S. Geological Survey as a primary source of data for a magnitude of 8.1.

Update Friday, March 5, 2021, 02:05

The tsunami warning was raised again after a third strong earthquake struck off the coast of the North Island, and the third strong New Zealand earthquake struck off the coast of North Island of New Zealand on Friday, March 5, 2021, at 7:28 a.m. local time. This magnitude 8.1 earthquake occurred near the Karmadyk Islands about 880 km north of New Zealand, at a depth of 20-24 km, and although this earthquake was not felt much in the nearby North Island, the New Zealand National Emergency Management Agency urged People in some areas have to go to higher ground. A tsunami warning has been raised over many coastal areas in both North and South Island of New Zealand.

The warning was raised later that day, 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 French Polynesia more than 3,000 kilometers northeast of the epicenter. The northern coast of the North Island of New Zealand was exposed to tsunamis, which reached a height of about 0.16 meters, or 16 cm only. The affected areas include the coasts from the North Cape to the East Cape, and no major damage has been reported.

According to the United States Geological Survey (USGS), the earthquake was caused by a reverse fault in the Tonga Kramadec subduction zone at a depth of about 22 km. The United States Geological Survey was also able to identify a previous 7.4 earthquake as a precursor of about 2 hours prior to this earthquake. The first of the three major earthquakes, which occurred 6 hours before the second earthquake, did not directly cause the second and third earthquakes.

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Date and time: March 4, 2021 19:28:31 UTC – Local time at the epicenter: Thursday, March 4, 2021 7:28 AM (GMT -12) Size: 8.1 Depth: 19.4 km Latitude / longitude of the epicenter: 29.7399 ° S / 177.2672 ° W (South Pacific, New Zealand) Closest volcano: Raul Island (239 km / 149 mi) Primary data source: United States Geological Survey (USGS) Estimated Outgoing Energy: 8.9 x 1016 J (24757) Gigawatt hours, equivalent to 2.1 x 107 tons of TNT or 1,331.3 atomic bombs!) More information

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If you feel this earthquake (or if you are near the epicenter), please share your experience and provide a short “Felt It” report! Other users would love to hear about it and also if you don’t feel an earthquake despite your presence in the area please report it! Your contribution is also valuable to seismology, earthquake risk analysis, and mitigation efforts. You can use your device’s location or the map to indicate where you are during an earthquake. Thank you! Data of the earthquake itself has been reported by various agencies

Information: The more agencies report the same earthquake and publish similar data, the more confident you will be in the data. It usually takes up to a few hours for earthquake parameters to be calculated with near-perfect accuracy.

MagnitudeDepthLocationSourceM 8.119 kmKermadec Islands, New Zealand USGSM 7.110 kmNew Zealand GEONET (NZ) M 7,923 kmKermadec Islands, New Zealand GeoAuM 8.125 kmKERMADEC ISLANDS, NEW ZEALANDEMSCM 7.81.6 km New Zealand [Sea]INGVM 8,024 km Karmadec Islands, New Zealand, GFZM 7,824 km, Karmadec Islands, New Zealand BMKG User reports on this earthquake (25)

Contribution: Leave a comment if you find a specific report interesting or want to add to it. Mark as inappropriate, tag useful or interesting, post your own user report

Waiau Pa near Clark Beach / Very weak vibration (MMI II) / Shaking and rolling: I was lying on my stomach on a mattress, doing a waking sleep, it felt like waves of waves from the ground and the glass doors shook badly | 18 users found this interesting.

1076 km southwest of the epicenter [Map] / Imperceptible: Ground rattling can be heard as dogs in town make thunder-like noises but the blue sky over them | 7 users found this interesting. (Reported through our app) 3002.4 km from the epicenter [Map] / Imperceptible: I didn’t feel but anxious about a potential massive earthquake. | 6 users found this interesting. (Reported by our app)

Russia, Sankt Petersburg City (GMT + 3), did not feel. / I do not feel: Oh my God, I did not feel in my apartment an earthquake, please stall all of you. | 4 users found this interesting.

1018.2 km southwest of the epicenter [Map] / Imperceptible: Nothing is felt in Kerikeri, Bay of Islands, Northland, New Zealand | 4 users found this interesting. (Reported by our app)

Auckland Northshore / Didn’t feel: I didn’t feel anything | 2 users found this interesting.

Eden Mountain Oakland / Light shaking (MMI IV) / Rattling, Shaking / Very short: I woke up from a slight shake – it felt as if someone was gently shaking my bed trying to fall asleep. I got up and looked at my little bed trying to spot the motion of his hanging crib toys but due to the lack of light I couldn’t see it properly. | One user found this interesting.

1125.9 km southwest of the epicenter [Map] / Don’t feel (reported by our app)

8,380.3 km northwest of the epicenter [Map] / No hair

Greece / Very weak vibration (MMI II)

1,214.4 km southwest of the epicenter [Map] / Severe vibration (MMI VIII) / Horizontal swing (side) (reported through our app) TAUPO NEW ZEALAND (1171.2 km SSW from the epicenter) [Map] / Moderate vibration (MMI V) (reported through our app) 3025.9 km from the epicenter [Map] / Don’t feel (reported by our app)

Orewa / light shaking (MMI IV) / rattling, shaking

Rangora, New Zealand (1,785.3 km southwest from the epicenter) [Map] / Mild vibration (MMI V)

Atlanta / Felt

Wanganui / does not feel

Mortlake vic Aus (3,769.8 km from the epicenter) [Map] / Not felt (reported through our app) 1777 km SSW from the epicenter [Map] / Weak vibration (MMI III) (reported through our app)

Turanga / No hair

Bosch apartment (1082.2 km south of the epicenter) [Map] / No hair

North Plummerstone / MMI (MMI V)

Christchurch / No Hair

Does it matter / violent vibration (MMI IX)

Turanga / Moderate Vibration (MMI V) / Rattling, Shaking / 2-5 seconds

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Aftershocks

More information

Depending on its size, the fissure that was active during the earthquake ruptured along roughly the surface. 12,589 square kilometers (= 4,861 square miles) as a first-class estimate. The rupture area is likely to be around 194 km (121 mi) long, and aftershocks usually occur during the weeks, months, or even years following an earthquake at or near the same fault, at distances of approximately. Twice the length of the fissure area. The broad linear arrangement of aftershock centers often includes the main shock rupture zone (see map below for verification) earthquake aftershocks recorded, most recent first (67 earthquakes so far, updated frequently): previous earthquakes in the same area, please wait while searching millions of records This may take up to 20-30 seconds.

Click here to search our database of previous earthquakes in the same region since 1900!

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