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Origin
PublicID |
2020p921638 |
UTC Time |
2020-12-07T00:09:06Z |
Latitude |
-42.06 (± 5.2
km)
|
Longitude |
174.33 (± 5.8
km)
|
Depth |
36 km (± 8 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
32 |
Used Station Count |
21 |
Standard Error |
0.59 (s) |
Azimuthal Gap |
151.54 (degrees) |
Minimum Distance |
0.27 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.5 |
|
ML |
4.3 (± 0.2) |
13 |
MLv |
4.5 (± 0.2) |
85 |
M |
4.5 |
85 |
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).