Magnitude 4.0, Wed Oct 23 2024 2:26 PM


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Origin


PublicID 2024p800164
UTC Time 2024-10-23T01:26:19Z
Latitude -30.24 (± 30.5 km)
Longitude -179.54 (± 85.8 km)
Depth 265 km (± 44 km)
Depth Type free
Earth Model iasp91
Used Phase Count 11
Used Station Count 9
Standard Error 0.79 (s)
Azimuthal Gap 215.53 (degrees)
Minimum Distance 1.71 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 4.0 (± 0.4)  
MLv 4.4 (± 0.8) 3
mB 4.8 (± 0.1) 14
Mw(mB) 4.0 (± 0.4) 14
M 4.1 14

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


-4.0-3.0-2.0-1.00.01.02.03.04.0residual (s)024681012Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.0Magnitude234567Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.06.0Magnitude810Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual234567Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual810Distance (degrees)Magnitude Residuals (mB)