Download Event Information
Origin
PublicID |
2021p730653 |
UTC Time |
2021-09-28T08:11:48Z |
Latitude |
-31.47 (± 7.7
km)
|
Longitude |
-179.60 (± 17.2
km)
|
Depth |
242 km (± 26 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
19 |
Used Station Count |
14 |
Standard Error |
1.20 (s) |
Azimuthal Gap |
159.94 (degrees) |
Minimum Distance |
2.63 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
4.5 (± 0.3) |
|
ML |
4.4 (± 0.1) |
9 |
MLv |
4.5 (± 0.3) |
6 |
mB |
4.6 (± 0.3) |
3 |
Mw(mB) |
3.9 (± 0.4) |
3 |
M |
4.4 |
6 |
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).