Download Event Information
Origin
PublicID |
2021p704366 |
UTC Time |
2021-09-18T14:45:27Z |
Latitude |
-33.20 (± 34.6
km)
|
Longitude |
179.50 (± 60.7
km)
|
Depth |
431 km (± 39 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
23 |
Used Station Count |
19 |
Standard Error |
0.47 (s) |
Azimuthal Gap |
344.98 (degrees) |
Minimum Distance |
4.76 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.6 |
|
ML |
3.8 (± 0.3) |
14 |
MLv |
3.7 (± 0.2) |
4 |
mB |
4.0 (± 0.2) |
3 |
Mw(mB) |
3.1 (± 0.4) |
3 |
M |
3.6 |
4 |
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).