| PublicID | 2021p370846 |
| UTC Time | 2021-05-18T05:05:16Z |
| Latitude | -31.65 (± 10.3 km) |
| Longitude | -178.79 (± 23.9 km) |
| Depth | 10 km (± 0 km) |
| Depth Type | operator assigned |
| Earth Model | iasp91 |
| Used Phase Count | 43 |
| Used Station Count | 36 |
| Standard Error | 2.08 (s) |
| Azimuthal Gap | 342.67 (degrees) |
| Minimum Distance | 6.36 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (mB) | 5.7 (± 0.2) | |
| mB | 5.7 (± 0.2) | 24 |
| Mw(mB) | 5.2 (± 0.4) | 24 |
| ML | 5.2 (± 0.2) | 28 |
| MLv | 5.6 (± 0.2) | 26 |
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.
