Magnitude 3.4, Fri Jul 25 2025 1:46 AM


Download Event Information


Origin


PublicID 2025p552905
UTC Time 2025-07-24T13:46:45Z
Latitude -31.93 (± 36.6 km)
Longitude -178.90 (± 87.6 km)
Depth 300 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 12
Used Station Count 9
Standard Error 0.61 (s)
Azimuthal Gap 353.79 (degrees)
Minimum Distance 6.42 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.4 (± 0.4)  
MLv 4.5 (± 0.1) 4
ML 4.1 (± 0.2) 4
mB 4.3 (± 0.2) 7
Mw(mB) 3.4 (± 0.4) 7
M 4.0 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


-7.0-5.0-3.0-1.01.03.05.07.0residual (s)0246810Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude7Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.03.04.05.0Magnitude7Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude79Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual7Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual7Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (mB)


-1.00.01.0Residual79Distance (degrees)Magnitude Residuals (mB)