Download Event Information
Origin
PublicID |
2021p807096 |
UTC Time |
2021-10-26T14:59:17Z |
Latitude |
-31.32 (± 11.8
km)
|
Longitude |
-177.72 (± 30.1
km)
|
Depth |
234 km (± 21 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
21 |
Used Station Count |
17 |
Standard Error |
0.78 (s) |
Azimuthal Gap |
208.85 (degrees) |
Minimum Distance |
2.06 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.6 (± 0.1) |
|
mB |
4.6 (± 0.1) |
8 |
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).