Magnitude 2.4, Fri Sep 14 2018 12:05 PM

Download Event Information


PublicID 2018p691903
UTC Time 2018-09-14T00:05:57Z
Latitude -42.43 (± 6.3 km)
Longitude 173.71 (± 8.1 km)
Depth 3 km (± 6 km)
Depth Type free
Earth Model iasp91
Used Phase Count 11
Used Station Count 8
Standard Error 0.57 (s)
Azimuthal Gap 200.04 (degrees)
Minimum Distance 0.02 (degrees)


Type Magnitude Station Count
Preferred (M) 2.4  
ML 2.5 (± 0.2) 6
MLv 2.4 (± 0.3) 5
M 2.4 5

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).

Origin Map

Map of New Zealand.

Map showing stations with picks used to locate the earthquake. Stations with picks that have a zero weight in the solution are shown as small grey circles. Those with a higher weight are shown as larger circles. The quake is shown by the largest circle.

Pick Residuals

-4.0-3.0-2.0- (s)012Distance (degrees)Pick Residuals

Station Magnitudes (ML) (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv) (degrees)Station Magnitudes (MLv)

Magnitude Residuals (ML)

- (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)

- (degrees)Magnitude Residuals (MLv)