PublicID | 2020p786750 |
UTC Time | 2020-10-18T02:20:12Z |
Latitude | -33.56 (± 15.8 km) |
Longitude | 179.20 (± 20.7 km) |
Depth | 287 km (± 25 km) |
Depth Type | free |
Earth Model | iasp91 |
Used Phase Count | 47 |
Used Station Count | 31 |
Standard Error | 1.02 (s) |
Azimuthal Gap | 340.51 (degrees) |
Minimum Distance | 4.06 (degrees) |
Type | Magnitude | Station Count |
Preferred (M) | 3.9 | |
MLv | 4.2 (± 0.2) | 12 |
ML | 4.0 (± 0.3) | 19 |
mB | 4.3 (± 0.4) | 6 |
Mw(mB) | 3.4 (± 0.4) | 6 |
M | 3.9 | 12 |
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.