  | |
| UTC time | 2021-03-04 17:41:25 |
|---|---|
| 2021-03-04 19:28:31 | |
| ISC event | 619918421 |
| 620360228 | |
| USGS-ANSS | ComCat |
| ComCat | |
| Local date | March 5, 2021 |
| Local time | 06:41:25 NZDT |
| 08:28:31 NZDT | |
| Magnitude | 7.4 Mw[1] |
| 8.1 Mw[2] | |
| Depth | 43.0 km (27 mi) |
| 28.9 km (18 mi) | |
| Epicentre | 29°44′06″S 177°16′55″W / 29.735°S 177.282°W |
| Fault | Kermadec-Tonga subduction zone |
| Type | Megathrust |
| Areas affected | New Zealand; Pacific islands |
| Total damage | Limited |
| Max. intensity | MMI VIII (Severe) |
| Peak acceleration | 0.75 g[3] |
| Tsunami | Up to 2.4 m (7.9 ft) in Raoul Island.[4][5] |
| Casualties | Several injured[4][better source needed] |
The 2021 Kermadec Islands earthquakes were a series of earthquakes with magnitudes of 8.1 and 7.4 that occurred at 19:28:31 UTC on 4 March 2021. The epicentres were located southeast of Raoul Island in the Kermadec Islands, part of the New Zealand outlying islands.[6] The main magnitude 8.1 earthquake was preceded by a magnitude 7.4 foreshock[7] and followed by a magnitude 6.1 aftershock.[8] A separate, unrelated magnitude 7.3 earthquake occurred off the coast of the North Island of New Zealand, approximately 900 km to the south, several hours before the main quakes.[9] More than a dozen aftershocks exceeded magnitude 6.[10]
- ^ "Technical Summary". 5 March 2021. Retrieved 20 October 2022.
- ^ "Technical Summary". 5 March 2021. Retrieved 20 October 2022.
- ^ "Numerous landslides reported on Raoul Island after strong earthquakes". www.geoengineer.org.
- ^ a b Cite error: The named reference
TSUNAMIwas invoked but never defined (see the help page). - ^ "M 8.1 Earthquake and Tsunami in Kermadec Islands, New Zealand on 04 Mar 2021 19:28 UTC". GDACS.
- ^ "M 8.1 - Kermadec Islands region". USGS-ANSS. Retrieved 4 March 2021.
- ^ "M 7.4 - Kermadec Islands, New Zealand". USGS-ANSS. Retrieved 4 March 2021.
- ^ "M 6.1 - Kermadec Islands region". USGS-ANSS. Retrieved 4 March 2021.
- ^ "GeoNet News: A morning of large offshore earthquakes - what happened and future scenarios". www.geonet.org.nz. Retrieved 5 March 2021.
- ^ "USGS earthquake Catalog". United States Geological Survey.