| PublicID | 2021p708053 |
| UTC Time | 2021-09-19T23:29:22Z |
| Latitude | -31.09 (± 16.8 km) |
| Longitude | -179.84 (± 44.9 km) |
| Depth | 293 km (± 22 km) |
| Depth Type | free |
| Earth Model | iasp91 |
| Used Phase Count | 29 |
| Used Station Count | 17 |
| Standard Error | 1.27 (s) |
| Azimuthal Gap | 201.73 (degrees) |
| Minimum Distance | 2.47 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (mB) | 4.7 (± 0.3) | |
| ML | 4.6 (± 0.3) | 6 |
| MLv | 4.7 (± 0.3) | 6 |
| mB | 4.7 (± 0.3) | 6 |
| Mw(mB) | 3.9 (± 0.4) | 6 |
| M | 4.4 | 6 |
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.