Download Event Information
Origin
PublicID |
2017p791872 |
UTC Time |
2017-10-20T23:49:41Z |
Latitude |
-37.83 (± 7.5
km)
|
Longitude |
177.61 (± 12.2
km)
|
Depth |
31 km (± 17 km) |
Depth Type |
free |
Earth Model |
nz3drx |
Used Phase Count |
11 |
Used Station Count |
11 |
Standard Error |
0.53 (s) |
Azimuthal Gap |
166.52 (degrees) |
Minimum Distance |
0.14 (degrees) |
Magnitudes
Type |
Magnitude |
Station Count |
Preferred (M) |
1.8 |
|
ML |
2.2 (± 0.3) |
8 |
MLv |
1.8 (± 0.5) |
6 |
M |
1.8 |
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).