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 | 2023p621574 |
| UTC Time | 2023-08-18T23:35:21Z |
| Latitude | -39.29 (± 4.2 km) |
| Longitude | 175.56 (± 4.5 km) |
| Depth | 4 km (± 4 km) |
| Depth Type | free |
| Earth Model | iasp91 |
| Used Phase Count | 8 |
| Used Station Count | 4 |
| Standard Error | 0.24 (s) |
| Azimuthal Gap | 164.92 (degrees) |
| Minimum Distance | 0.01 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (MLv) | 0.8 (± 0.1) | |
| MLv | 0.8 (± 0.1) | 4 |
| ML | 0.5 (± 0.3) | 4 |
| M | 0.8 | 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.