Download Event Information
Origin
PublicID |
2015p375719 |
UTC Time |
2015-05-20T00:23:29Z |
Latitude |
-39.76 (± 3.3
km)
|
Longitude |
174.92 (± 3.3
km)
|
Depth |
78 km (± 8 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
94 |
Used Station Count |
67 |
Standard Error |
0.61 (s) |
Azimuthal Gap |
76.64 (degrees) |
Minimum Distance |
0.05 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.1 |
|
MLv |
4.1 (± 0.2) |
51 |
ML |
4.4 (± 0.2) |
50 |
M |
4.1 |
51 |
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).