Download Event Information
Origin
PublicID |
2012p181886 |
UTC Time |
2012-03-08T07:09:05Z |
Latitude |
-40.70 (± 1.2
km)
|
Longitude |
174.69 (± 1.8
km)
|
Depth |
83 km (± 3 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
85 |
Used Station Count |
77 |
Standard Error |
0.50 (s) |
Azimuthal Gap |
69.39 (degrees) |
Minimum Distance |
0.23 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.7 |
|
MLv |
4.7 (± 0.2) |
45 |
M |
4.7 |
45 |
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).