Magnitude 1.4, Thu Apr 24 2014 1:43 PM


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Origin


PublicID 2014p305599
UTC Time 2014-04-24T01:43:14Z
Latitude -39.23 (± 2.8 km)
Longitude 175.14 (± 2.2 km)
Depth 3 km (± 2 km)
Depth Type free
Earth Model iasp91
Used Phase Count 14
Used Station Count 9
Standard Error 0.38 (s)
Azimuthal Gap 166.92 (degrees)
Minimum Distance 0.28 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 1.4  
MLv 1.4 (± 0.1) 6
ML 1.7 (± 0.2) 6
M 1.4 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).

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)01Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.0Magnitude0Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.03.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Magnitude Residuals (MLv)


-2.0-1.00.01.02.0Residual0Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (ML)


-2.0-1.00.01.02.0Residual0Distance (degrees)Magnitude Residuals (ML)