Download Event Information
Origin
PublicID |
2015p541738 |
UTC Time |
2015-07-20T10:38:27Z |
Latitude |
-43.59 (± 3.0
km)
|
Longitude |
172.70 (± 2.8
km)
|
Depth |
10 km (± 4 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
21 |
Used Station Count |
15 |
Standard Error |
1.65 (s) |
Azimuthal Gap |
88.46 (degrees) |
Minimum Distance |
0.12 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.1 |
|
MLv |
2.9 (± 0.5) |
18 |
ML |
3.0 (± 0.5) |
18 |
mB |
5.3 (± 0.4) |
3 |
Mw(mB) |
4.8 (± 0.4) |
3 |
M |
3.1 |
18 |
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).