Download Event Information
Origin
PublicID |
2016p959791 |
UTC Time |
2016-12-21T02:57:04Z |
Latitude |
-37.11 (± 5.6
km)
|
Longitude |
179.12 (± 9.3
km)
|
Depth |
15 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
21 |
Used Station Count |
17 |
Standard Error |
0.68 (s) |
Azimuthal Gap |
273.46 (degrees) |
Minimum Distance |
0.79 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.9 |
|
MLv |
3.9 (± 0.2) |
13 |
ML |
4.2 (± 0.3) |
13 |
M |
3.9 |
13 |
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).