Download Event Information
Origin
PublicID |
2017p657640 |
UTC Time |
2017-09-01T07:50:52Z |
Latitude |
-40.66 (± 3.0
km)
|
Longitude |
175.83 (± 3.0
km)
|
Depth |
19 km (± 5 km) |
Depth Type |
free |
Earth Model |
iasp91 |
Used Phase Count |
20 |
Used Station Count |
14 |
Standard Error |
0.34 (s) |
Azimuthal Gap |
50.03 (degrees) |
Minimum Distance |
0.13 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.6 |
|
MLv |
3.6 (± 0.1) |
71 |
ML |
4.1 (± 0.2) |
12 |
M |
3.6 |
71 |
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).