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Origin
PublicID |
2015p549430 |
UTC Time |
2015-07-23T06:56:30Z |
Latitude |
-38.41 (± 1.8
km)
|
Longitude |
177.87 (± 2.5
km)
|
Depth |
21 km (± 3 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
56 |
Used Station Count |
39 |
Standard Error |
1.38 (s) |
Azimuthal Gap |
74.73 (degrees) |
Minimum Distance |
0.04 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.5 |
|
MLv |
3.5 (± 0.2) |
79 |
ML |
3.8 (± 0.2) |
79 |
mB |
5.2 |
1 |
Mw(mB) |
4.6 (± 0.4) |
1 |
M |
3.5 |
79 |
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).