Download Event Information
Origin
PublicID |
2021p296089 |
UTC Time |
2021-04-20T13:16:26Z |
Latitude |
-41.15 (± 9.7
km)
|
Longitude |
173.44 (± 4.5
km)
|
Depth |
76 km (± 9 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
20 |
Used Station Count |
12 |
Standard Error |
0.55 (s) |
Azimuthal Gap |
111.09 (degrees) |
Minimum Distance |
0.08 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
1.7 (± 0.1) |
|
MLv |
1.7 (± 0.1) |
3 |
ML |
1.9 (± 0.3) |
9 |
M |
1.7 |
3 |
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).