Download Event Information
Origin
PublicID |
2013p537512 |
UTC Time |
2013-07-18T21:06:39Z |
Latitude |
-41.55 (± 0.5
km)
|
Longitude |
174.40 (± 0.6
km)
|
Depth |
21 km (± 2 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
52 |
Used Station Count |
40 |
Standard Error |
0.26 (s) |
Azimuthal Gap |
123.07 (degrees) |
Minimum Distance |
0.25 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
5.7 |
|
MLv |
5.7 (± 0.2) |
23 |
ML |
6.0 (± 0.2) |
19 |
M |
5.7 |
23 |
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).