Magnitude 3.9, Fri Jul 26 2024 9:26 AM


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Origin


PublicID 2024p559173
UTC Time 2024-07-25T21:26:46Z
Latitude -33.26 (± 15.4 km)
Longitude 179.66 (± 43.8 km)
Depth 300 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 15
Used Station Count 9
Standard Error 0.73 (s)
Azimuthal Gap 348.78 (degrees)
Minimum Distance 4.43 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.9 (± 0.4)  
mB 4.7 1
Mw(mB) 3.9 (± 0.4) 1
ML 3.8 (± 0.5) 4
MLv 3.9 (± 0.2) 6
M 3.9 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


-2.0-1.00.01.02.0residual (s)0123456Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Station Magnitudes (ML)


0.01.02.03.04.05.0Magnitude5Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude5Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (ML)


-1.00.01.0Residual5Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual5Distance (degrees)Magnitude Residuals (MLv)