Download Event Information
Origin
PublicID |
2015p154355 |
UTC Time |
2015-02-27T02:39:56Z |
Latitude |
-32.78 (± 8.3
km)
|
Longitude |
179.67 (± 20.3
km)
|
Depth |
140 km (± 31 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
66 |
Used Station Count |
40 |
Standard Error |
1.86 (s) |
Azimuthal Gap |
180.87 (degrees) |
Minimum Distance |
4.07 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.4 |
|
MLv |
5.1 (± 0.2) |
30 |
mB |
4.9 (± 0.3) |
20 |
Mw(mB) |
4.2 (± 0.4) |
20 |
M |
4.4 |
30 |
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).