Download Event Information
Origin
PublicID |
2020p092995 |
UTC Time |
2020-02-04T09:47:26Z |
Latitude |
-37.63 (± 4.8
km)
|
Longitude |
176.55 (± 4.4
km)
|
Depth |
257 km (± 4 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
91 |
Used Station Count |
60 |
Standard Error |
0.51 (s) |
Azimuthal Gap |
112.62 (degrees) |
Minimum Distance |
0.21 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
5.5 |
|
M |
5.5 |
74 |
MLv |
5.5 (± 0.3) |
74 |
ML |
4.5 (± 0.3) |
7 |
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).