Download Event Information
Origin
PublicID |
2021p092252 |
UTC Time |
2021-02-04T03:11:58Z |
Latitude |
-43.38 (± 2.1
km)
|
Longitude |
172.63 (± 3.3
km)
|
Depth |
22 km (± 6 km) |
Depth Type |
free |
Earth Model |
tab |
Used Phase Count |
30 |
Used Station Count |
16 |
Standard Error |
0.65 (s) |
Azimuthal Gap |
59.68 (degrees) |
Minimum Distance |
0.03 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
3.2 (± 0.3) |
|
ML |
3.2 (± 0.2) |
8 |
MLv |
3.2 (± 0.3) |
8 |
M |
3.2 |
8 |
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).