Download Event Information
Origin
PublicID |
2018p943373 |
UTC Time |
2018-12-16T01:04:44Z |
Latitude |
-29.85 (± 4.0
km)
|
Longitude |
-176.23 (± 8.6
km)
|
Depth |
33 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
28 |
Used Station Count |
15 |
Standard Error |
2.40 (s) |
Azimuthal Gap |
275.54 (degrees) |
Minimum Distance |
1.58 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.9 (± 0.3) |
|
MLv |
4.7 (± 0.3) |
2 |
ML |
4.9 (± 0.2) |
2 |
mB |
4.9 (± 0.3) |
9 |
Mw(mB) |
4.2 (± 0.4) |
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).