At 2:27 a.m., on Friday 5 March 2021 NZDT, a magnitude 7.2 earthquake struck 125 km east of Te Araroa, East Cape.
| PublicID | 2021p169083 |
| UTC Time | 2021-03-04T13:27:35Z |
| Latitude | -37.40 (± 7.1 km) |
| Longitude | 179.96 (± 9.5 km) |
| Depth | 33 km (± 0 km) |
| Depth Type | operator assigned |
| Earth Model | iasp91 |
| Used Phase Count | 32 |
| Used Station Count | 28 |
| Standard Error | 0.60 (s) |
| Azimuthal Gap | 291.12 (degrees) |
| Minimum Distance | 1.16 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (M) | 7.2 | |
| M | 7.2 | 41 |
GeoNet combines magnitudes into a summary magnitude, M, which consists of a weighted average of the individual magnitudes and attempts to be a best possible compromise between all magnitudes for a range of earthquake sizes.
Summary magnitude for GeoNet is then defined as:
M = (2 * MLv + (0.4 * number_of stations(Mw(mB)) - 1) * Mw(mB)) / (2 + (0.4 * number_of_stations(Mw(mB)) - 1))
Where MLv is local magnitude calculated on the vertical component and Mw(mB) is a Mw estimation based of mB by Bormann and Saul (2008).
Map showing stations with picks used to locate the earthquake. Stations with picks that have a zero weight in the solution are shown as small grey circles. Those with a higher weight are shown as larger circles. The quake is shown by the largest circle.