Download Event Information
Origin
PublicID |
2021p318418 |
UTC Time |
2021-04-28T19:33:35Z |
Latitude |
-37.19 (± 6.2
km)
|
Longitude |
177.28 (± 4.7
km)
|
Depth |
136 km (± 8 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
50 |
Used Station Count |
39 |
Standard Error |
0.53 (s) |
Azimuthal Gap |
172.48 (degrees) |
Minimum Distance |
0.69 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.5 |
|
ML |
4.4 (± 0.3) |
19 |
MLv |
4.5 (± 0.3) |
25 |
M |
4.5 |
25 |
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).