Download Event Information
Origin
PublicID |
2021p334808 |
UTC Time |
2021-05-04T21:05:59Z |
Latitude |
-37.35 (± 4.9
km)
|
Longitude |
177.40 (± 2.9
km)
|
Depth |
5 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
tab |
Used Phase Count |
39 |
Used Station Count |
36 |
Standard Error |
1.12 (s) |
Azimuthal Gap |
161.65 (degrees) |
Minimum Distance |
0.24 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (MLv) |
2.9 (± 0.2) |
|
ML |
2.8 (± 0.2) |
28 |
MLv |
2.9 (± 0.2) |
25 |
M |
2.9 |
25 |
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).