| PublicID | 2021p135724 |
| UTC Time | 2021-02-20T05:15:06Z |
| Latitude | -41.09 (± 2.2 km) |
| Longitude | 174.95 (± 1.8 km) |
| Depth | 25 km (± 2 km) |
| Depth Type | free |
| Earth Model | iasp91 |
| Used Phase Count | 59 |
| Used Station Count | 31 |
| Standard Error | 0.70 (s) |
| Azimuthal Gap | 62.47 (degrees) |
| Minimum Distance | 0.07 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (M) | 4.5 | |
| M | 4.5 | 109 |
| MLv | 4.5 (± 0.2) | 109 |
| ML | 4.7 (± 0.2) | 18 |
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.