Download Event Information
Origin
PublicID |
2021p055591 |
UTC Time |
2021-01-21T13:36:13Z |
Latitude |
-35.40 (± 7.1
km)
|
Longitude |
-175.72 (± 10.1
km)
|
Depth |
150 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
26 |
Used Station Count |
15 |
Standard Error |
1.50 (s) |
Azimuthal Gap |
253.21 (degrees) |
Minimum Distance |
5.27 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.7 (± 1.0) |
|
ML |
4.3 (± 0.1) |
7 |
MLv |
4.3 (± 0.1) |
4 |
mB |
4.7 (± 1.0) |
3 |
Mw(mB) |
3.9 (± 1.0) |
3 |
M |
4.2 |
4 |
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).