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Origin
PublicID |
2017p229781 |
UTC Time |
2017-03-27T00:27:27Z |
Latitude |
-38.83 (± 5.8
km)
|
Longitude |
175.96 (± 5.3
km)
|
Depth |
86 km (± 8 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
30 |
Used Station Count |
21 |
Standard Error |
0.26 (s) |
Azimuthal Gap |
92.92 (degrees) |
Minimum Distance |
0.22 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
1.8 |
|
MLv |
1.8 (± 0.3) |
9 |
ML |
1.9 (± 0.2) |
6 |
M |
1.8 |
9 |
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).