Phase one of our updated website is now live. Explore GeoNet beta and let us know what you think. Read this news article to find out what's happening.
| PublicID | 2021p310230 |
| UTC Time | 2021-04-25T18:49:46Z |
| Latitude | -32.50 (± 7.1 km) |
| Longitude | -178.68 (± 19.3 km) |
| Depth | 10 km (± 0 km) |
| Depth Type | operator assigned |
| Earth Model | iasp91 |
| Used Phase Count | 28 |
| Used Station Count | 23 |
| Standard Error | 1.91 (s) |
| Azimuthal Gap | 190.11 (degrees) |
| Minimum Distance | 3.29 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (mB) | 5.4 (± 0.1) | |
| ML | 4.6 (± 0.2) | 18 |
| MLv | 5.0 (± 0.1) | 14 |
| mB | 5.4 (± 0.1) | 12 |
| Mw(mB) | 4.9 (± 0.4) | 12 |
| M | 4.9 | 14 |
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.