Magnitude 5.7, Sun Feb 14 2016 1:13 PM



Download Event Information


Origin


PublicID 2016p118944
UTC Time 2016-02-14T00:13:43Z
Latitude -43.50 (± 2.8 km)
Longitude 172.75 (± 3.5 km)
Depth 8 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 15
Used Station Count 9
Standard Error 0.45 (s)
Azimuthal Gap 114.44 (degrees)
Minimum Distance 0.22 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 5.7  
MLv 5.7 (± 0.2) 7
ML 6.0 (± 0.2) 7
M 5.7 7

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


-5.0-3.0-1.01.03.05.0residual (s)01234567Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.07.0Magnitude0Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.03.04.05.06.07.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (ML)