Download Event Information
Origin
PublicID |
2017p128446 |
UTC Time |
2017-02-17T12:36:15Z |
Latitude |
-42.66 (± 3.6
km)
|
Longitude |
172.94 (± 6.3
km)
|
Depth |
25 km (± 9 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
39 |
Used Station Count |
28 |
Standard Error |
0.70 (s) |
Azimuthal Gap |
105.62 (degrees) |
Minimum Distance |
0.32 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
3.9 |
|
MLv |
3.9 (± 0.2) |
22 |
ML |
4.0 (± 0.2) |
22 |
M |
3.9 |
22 |
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).