PublicID | 2021p708647 |
UTC Time | 2021-09-20T04:46:36Z |
Latitude | -32.60 (± 6.7 km) |
Longitude | 179.81 (± 13.7 km) |
Depth | 300 km (± 17 km) |
Depth Type | free |
Earth Model | iasp91 |
Used Phase Count | 29 |
Used Station Count | 26 |
Standard Error | 1.17 (s) |
Azimuthal Gap | 161.35 (degrees) |
Minimum Distance | 3.87 (degrees) |
Type | Magnitude | Station Count |
Preferred (mB) | 4.7 (± 0.1) | |
ML | 4.3 | 1 |
MLv | 4.8 (± 0.1) | 16 |
mB | 4.7 (± 0.1) | 12 |
Mw(mB) | 4.0 (± 0.4) | 12 |
M | 4.2 | 16 |
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.