Download Event Information
Origin
PublicID |
2017p968142 |
UTC Time |
2017-12-25T05:06:06Z |
Latitude |
-39.25 (± 4.1
km)
|
Longitude |
175.02 (± 1.7
km)
|
Depth |
16 km (± 4 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
54 |
Used Station Count |
39 |
Standard Error |
0.30 (s) |
Azimuthal Gap |
71.63 (degrees) |
Minimum Distance |
0.24 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.1 |
|
MLv |
4.1 (± 0.2) |
31 |
ML |
4.4 (± 0.2) |
30 |
M |
4.1 |
31 |
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).