Download Event Information
Origin
PublicID |
2023p568770 |
UTC Time |
2023-07-30T10:41:09Z |
Latitude |
-40.99 (± 3.4
km)
|
Longitude |
174.90 (± 4.8
km)
|
Depth |
40 km (± 4 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
33 |
Used Station Count |
26 |
Standard Error |
0.37 (s) |
Azimuthal Gap |
61.92 (degrees) |
Minimum Distance |
0.11 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
4.6 (± 0.2) |
|
ML |
4.5 (± 0.2) |
15 |
MLv |
4.6 (± 0.2) |
42 |
M |
4.6 |
42 |
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).