Download Event Information
Origin
PublicID |
2021p880897 |
UTC Time |
2021-11-22T22:22:23Z |
Latitude |
-42.93 (± 2.6
km)
|
Longitude |
171.59 (± 2.8
km)
|
Depth |
4 km (± 3 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
21 |
Used Station Count |
15 |
Standard Error |
0.39 (s) |
Azimuthal Gap |
66.15 (degrees) |
Minimum Distance |
0.03 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
2.7 |
|
ML |
2.5 (± 0.1) |
9 |
MLv |
2.7 (± 0.2) |
10 |
M |
2.7 |
10 |
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).