Download Event Information
Origin
PublicID |
2020p953695 |
UTC Time |
2020-12-18T20:49:11Z |
Latitude |
-32.85 (± 5.0
km)
|
Longitude |
-178.34 (± 12.3
km)
|
Depth |
12 km (± 0 km) |
Depth Type |
operator assigned |
Earth Model |
iasp91 |
Used Phase Count |
31 |
Used Station Count |
21 |
Standard Error |
1.32 (s) |
Azimuthal Gap |
167.50 (degrees) |
Minimum Distance |
3.60 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
5.7 (± 0.2) |
|
ML |
5.3 (± 0.3) |
16 |
MLv |
5.4 (± 0.2) |
16 |
mB |
5.7 (± 0.2) |
13 |
Mw(mB) |
5.2 (± 0.4) |
13 |
M |
5.2 |
16 |
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).