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Origin
PublicID |
2017p618213 |
UTC Time |
2017-08-17T17:40:00Z |
Latitude |
-17.26 (± 54.1
km)
|
Longitude |
170.62 (± 47.0
km)
|
Depth |
224 km (± 48 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
40 |
Used Station Count |
40 |
Standard Error |
1.44 (s) |
Azimuthal Gap |
345.83 (degrees) |
Minimum Distance |
18.08 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.8 |
|
mB |
4.6 (± 0.1) |
12 |
Mw(mB) |
3.8 (± 0.4) |
12 |
M |
3.8 |
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).