Download Event Information
Origin
PublicID |
2020p031621 |
UTC Time |
2020-01-12T16:44:40Z |
Latitude |
-22.47 (± 8.1
km)
|
Longitude |
-177.39 (± 13.0
km)
|
Depth |
373 km (± 10 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
31 |
Used Station Count |
22 |
Standard Error |
1.51 (s) |
Azimuthal Gap |
191.72 (degrees) |
Minimum Distance |
6.78 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (mB) |
4.4 (± 0.2) |
|
MLv |
5.5 |
1 |
mB |
4.4 (± 0.2) |
6 |
Mw(mB) |
3.5 (± 0.4) |
6 |
M |
4.7 |
6 |
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).