Download Event Information
Origin
PublicID |
2017p797068 |
UTC Time |
2017-10-22T21:57:55Z |
Latitude |
-39.41 (± 4.9
km)
|
Longitude |
175.96 (± 2.5
km)
|
Depth |
42 km (± 6 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
30 |
Used Station Count |
19 |
Standard Error |
0.41 (s) |
Azimuthal Gap |
109.29 (degrees) |
Minimum Distance |
0.11 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
1.2 |
|
MLv |
1.2 (± 0.3) |
8 |
ML |
1.5 (± 0.2) |
15 |
M |
1.2 |
8 |
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).