Download Event Information
Origin
PublicID |
2021p695335 |
UTC Time |
2021-09-15T06:33:48Z |
Latitude |
-31.74 (± 7.4
km)
|
Longitude |
-179.83 (± 16.9
km)
|
Depth |
369 km (± 18 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
20 |
Used Station Count |
16 |
Standard Error |
1.26 (s) |
Azimuthal Gap |
158.67 (degrees) |
Minimum Distance |
2.97 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
5.0 (± 0.1) |
|
MLv |
5.0 (± 0.1) |
9 |
mB |
4.5 (± 0.1) |
5 |
Mw(mB) |
3.7 (± 0.4) |
5 |
M |
4.6 |
9 |
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).