Download Event Information
Origin
PublicID |
2021p810068 |
UTC Time |
2021-10-27T17:21:25Z |
Latitude |
-26.75 (± 19.3
km)
|
Longitude |
-179.26 (± 40.2
km)
|
Depth |
556 km (± 39 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
11 |
Used Station Count |
10 |
Standard Error |
0.67 (s) |
Azimuthal Gap |
300.70 (degrees) |
Minimum Distance |
2.77 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.3 (± 0.3) |
|
mB |
4.3 (± 0.3) |
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).