Download Event Information
Origin
PublicID |
2015p383071 |
UTC Time |
2015-05-22T17:40:39Z |
Latitude |
-42.15 (± 3.3
km)
|
Longitude |
173.12 (± 3.5
km)
|
Depth |
36 km (± 7 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
38 |
Used Station Count |
34 |
Standard Error |
1.35 (s) |
Azimuthal Gap |
60.19 (degrees) |
Minimum Distance |
0.41 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.5 |
|
MLv |
4.8 (± 0.2) |
116 |
ML |
5.0 (± 0.3) |
115 |
mB |
5.1 (± 0.2) |
12 |
Mw(mB) |
4.4 (± 0.4) |
12 |
M |
4.5 |
116 |
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).