Download Event Information
Origin
PublicID |
2020p881852 |
UTC Time |
2020-11-22T06:49:58Z |
Latitude |
-29.15 (± 8.1
km)
|
Longitude |
-178.04 (± 14.6
km)
|
Depth |
411 km (± 6 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
32 |
Used Station Count |
21 |
Standard Error |
1.16 (s) |
Azimuthal Gap |
170.81 (degrees) |
Minimum Distance |
0.13 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.5 (± 0.4) |
|
MLv |
2.6 (± 0.1) |
3 |
mB |
4.5 (± 0.4) |
7 |
Mw(mB) |
3.7 (± 0.4) |
7 |
M |
3.1 |
7 |
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).