Download Event Information
Origin
PublicID |
2021p703265 |
UTC Time |
2021-09-18T04:59:39Z |
Latitude |
-41.37 (± 6.3
km)
|
Longitude |
172.54 (± 6.2
km)
|
Depth |
84 km (± 8 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
17 |
Used Station Count |
10 |
Standard Error |
0.62 (s) |
Azimuthal Gap |
123.49 (degrees) |
Minimum Distance |
0.14 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
2.0 |
|
MLv |
2.0 |
1 |
M |
2.0 |
1 |
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).