Download Event Information
Origin
PublicID |
2021p549612 |
UTC Time |
2021-07-23T08:33:35Z |
Latitude |
-39.50 (± 7.4
km)
|
Longitude |
174.35 (± 6.9
km)
|
Depth |
121 km (± 11 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
21 |
Used Station Count |
18 |
Standard Error |
0.46 (s) |
Azimuthal Gap |
92.74 (degrees) |
Minimum Distance |
0.05 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
2.0 |
|
MLv |
2.0 (± 0.2) |
5 |
ML |
1.9 (± 0.3) |
7 |
M |
2.0 |
5 |
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).