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Origin
PublicID |
2018p621804 |
UTC Time |
2018-08-19T01:34:23Z |
Latitude |
-17.49 (± 18.2
km)
|
Longitude |
-178.50 (± 102.2
km)
|
Depth |
550 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
29 |
Used Station Count |
25 |
Standard Error |
2.26 (s) |
Azimuthal Gap |
353.07 (degrees) |
Minimum Distance |
20.45 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
4.3 |
|
mB |
5.0 (± 0.2) |
12 |
Mw(mB) |
4.3 (± 0.4) |
12 |
M |
4.3 |
12 |
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).