Download Event Information
Origin
PublicID |
2021p039206 |
UTC Time |
2021-01-15T12:09:18Z |
Latitude |
-41.80 (± 3.1
km)
|
Longitude |
174.12 (± 4.5
km)
|
Depth |
12 km (± 7 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
16 |
Used Station Count |
12 |
Standard Error |
0.40 (s) |
Azimuthal Gap |
103.88 (degrees) |
Minimum Distance |
0.03 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
1.6 |
|
MLv |
1.6 (± 0.4) |
7 |
ML |
1.3 (± 0.4) |
5 |
M |
1.6 |
7 |
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).