Magnitude 6.5, Tue Feb 2 2016 8:00 AM



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Origin


PublicID 2016p085927
UTC Time 2016-02-01T19:00:45Z
Latitude -30.92 (± 0.0 km)
Longitude -179.99 (± 0.0 km)
Depth 382 km (± 0 km)
Depth Type free
Earth Model
Used Phase Count 0
Used Station Count 0
Standard Error 2.80 (s)
Azimuthal Gap 0.00 (degrees)
Minimum Distance 0.00 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 6.5  
ML 7.2 (± 0.2) 45
MLv 7.2 (± 0.2) 51
mB 6.6 (± 0.2) 54
Mw(mB) 6.4 (± 0.4) 54
M 6.5 54

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


-8.0-6.0-4.0-2.00.02.04.06.08.0residual (s)0123456789Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.05.06.07.08.0Magnitude012Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.05.06.07.08.0Magnitude0123456Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.08.0Magnitude0123Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (ML)


-1.00.01.0Residual012Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual0123456Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual0123Distance (degrees)Magnitude Residuals (mB)