Download Event Information
Origin
PublicID |
2021p706377 |
UTC Time |
2021-09-19T08:36:51Z |
Latitude |
-33.76 (± 10.7
km)
|
Longitude |
-178.43 (± 20.1
km)
|
Depth |
33 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
18 |
Used Station Count |
12 |
Standard Error |
0.69 (s) |
Azimuthal Gap |
321.16 (degrees) |
Minimum Distance |
4.63 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
4.3 (± 0.1) |
|
MLv |
4.3 (± 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).