Download Event Information
Origin
PublicID |
2021p692999 |
UTC Time |
2021-09-14T09:50:19Z |
Latitude |
-40.01 (± 9.2
km)
|
Longitude |
173.66 (± 8.8
km)
|
Depth |
205 km (± 9 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
32 |
Used Station Count |
25 |
Standard Error |
0.35 (s) |
Azimuthal Gap |
136.74 (degrees) |
Minimum Distance |
0.58 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
4.4 (± 0.3) |
|
MLv |
4.4 (± 0.3) |
110 |
M |
4.4 |
110 |
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).