Download Event Information
Origin
PublicID |
2020p819816 |
UTC Time |
2020-10-30T07:56:26Z |
Latitude |
-28.90 (± 12.8
km)
|
Longitude |
-176.63 (± 27.8
km)
|
Depth |
172 km (± 19 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
34 |
Used Station Count |
19 |
Standard Error |
1.23 (s) |
Azimuthal Gap |
146.45 (degrees) |
Minimum Distance |
1.19 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.4 (± 0.2) |
|
MLv |
4.0 |
1 |
ML |
4.1 |
1 |
mB |
4.4 (± 0.2) |
2 |
Mw(mB) |
3.5 (± 0.4) |
2 |
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).