Download Event Information
Origin
PublicID |
2021p703219 |
UTC Time |
2021-09-18T04:35:10Z |
Latitude |
-43.57 (± 2.4
km)
|
Longitude |
172.06 (± 2.4
km)
|
Depth |
3 km (± 3 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
24 |
Used Station Count |
17 |
Standard Error |
0.31 (s) |
Azimuthal Gap |
61.82 (degrees) |
Minimum Distance |
0.03 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
1.8 (± 0.2) |
|
ML |
1.8 (± 0.3) |
7 |
MLv |
1.8 (± 0.2) |
5 |
M |
1.8 |
5 |
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).