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Origin
PublicID |
2020p891009 |
UTC Time |
2020-11-25T16:08:32Z |
Latitude |
-32.12 (± 24.4
km)
|
Longitude |
-177.66 (± 39.6
km)
|
Depth |
256 km (± 43 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
23 |
Used Station Count |
12 |
Standard Error |
0.96 (s) |
Azimuthal Gap |
353.37 (degrees) |
Minimum Distance |
6.71 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.6 |
|
MLv |
4.6 (± 0.3) |
7 |
mB |
4.4 |
1 |
Mw(mB) |
3.5 (± 0.4) |
1 |
M |
4.6 |
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).