Download Event Information
Origin
PublicID |
2021p565894 |
UTC Time |
2021-07-29T09:07:44Z |
Latitude |
-32.89 (± 23.9
km)
|
Longitude |
179.05 (± 43.8
km)
|
Depth |
427 km (± 35 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
23 |
Used Station Count |
16 |
Standard Error |
0.41 (s) |
Azimuthal Gap |
339.03 (degrees) |
Minimum Distance |
4.70 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.9 |
|
mB |
4.0 (± 0.2) |
18 |
Mw(mB) |
3.1 (± 0.4) |
3 |
ML |
4.0 (± 0.2) |
8 |
MLv |
3.9 (± 0.2) |
6 |
M |
3.9 |
6 |
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).