Magnitude 2.3, Sun Nov 4 2018 9:35 PM



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Origin


PublicID 2018p830697
UTC Time 2018-11-04T08:35:28Z
Latitude -39.06 (± 2.4 km)
Longitude 173.96 (± 3.5 km)
Depth 10 km (± 5 km)
Depth Type free
Earth Model nz3drx
Used Phase Count 15
Used Station Count 9
Standard Error 0.26 (s)
Azimuthal Gap 252.65 (degrees)
Minimum Distance 0.13 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 2.3  
ML 2.6 (± 0.3) 6
MLv 2.3 (± 0.3) 7
M 2.3 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


-2.0-1.00.01.02.0residual (s)01Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.0Magnitude0Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (MLv)