Download Event Information
Origin
PublicID |
2021p271931 |
UTC Time |
2021-04-11T14:40:09Z |
Latitude |
-30.09 (± 3.3
km)
|
Longitude |
-176.88 (± 9.9
km)
|
Depth |
33 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
25 |
Used Station Count |
24 |
Standard Error |
2.87 (s) |
Azimuthal Gap |
187.89 (degrees) |
Minimum Distance |
1.23 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.8 (± 0.0) |
|
mB |
4.8 (± 0.0) |
4 |
ML |
5.4 |
1 |
MLv |
5.3 (± 0.1) |
3 |
Mw(mB) |
4.1 (± 0.4) |
0 |
M |
5.3 |
3 |
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).