Download Event Information
Origin
PublicID |
2012p001887 |
UTC Time |
2012-01-01T16:45:17Z |
Latitude |
-43.47 (± 3.7
km)
|
Longitude |
172.81 (± 4.1
km)
|
Depth |
12 km (± 7 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
19 |
Used Station Count |
12 |
Standard Error |
0.42 (s) |
Azimuthal Gap |
160.94 (degrees) |
Minimum Distance |
0.07 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
5.5 (± 0.4) |
|
ML |
5.7 (± 0.4) |
25 |
MLv |
5.5 (± 0.4) |
25 |
Mjma |
4.9 |
1 |
M |
5.5 |
25 |
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).