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 | 2019p299265 |
| UTC Time | 2019-04-21T17:25:18Z |
| Latitude | -32.38 (± 14.8 km) |
| Longitude | 179.61 (± 36.1 km) |
| Depth | 409 km (± 17 km) |
| Depth Type | free |
| Earth Model | iasp91 |
| Used Phase Count | 41 |
| Used Station Count | 23 |
| Standard Error | 1.59 (s) |
| Azimuthal Gap | 349.61 (degrees) |
| Minimum Distance | 5.28 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (M) | 3.9 | |
| MLv | 4.0 (± 0.0) | 4 |
| mB | 4.2 (± 0.0) | 3 |
| Mw(mB) | 3.3 (± 0.4) | 3 |
| M | 3.9 | 4 |
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.