Download Event Information
Origin
PublicID |
2021p301009 |
UTC Time |
2021-04-22T08:55:25Z |
Latitude |
-19.79 (± 10.9
km)
|
Longitude |
-177.44 (± 12.0
km)
|
Depth |
564 km (± 22 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
22 |
Used Station Count |
21 |
Standard Error |
1.16 (s) |
Azimuthal Gap |
138.88 (degrees) |
Minimum Distance |
5.49 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
5.0 (± 0.1) |
|
mB |
5.0 (± 0.1) |
12 |
Mw(mB) |
4.4 (± 0.4) |
7 |
MLv |
5.5 (± 0.1) |
2 |
M |
5.0 |
7 |
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).