Magnitude 3.1, Sat Jul 26 2025 5:35 PM


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Origin


PublicID 2025p557386
UTC Time 2025-07-26T05:35:02Z
Latitude -32.69 (± 12.5 km)
Longitude 178.74 (± 49.7 km)
Depth 300 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 12
Used Station Count 8
Standard Error 0.35 (s)
Azimuthal Gap 349.90 (degrees)
Minimum Distance 4.88 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.1 (± 0.4)  
MLv 4.0 (± 0.3) 4
mB 4.1 (± 0.2) 5
Mw(mB) 3.1 (± 0.4) 5
M 3.7 5

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


-3.0-2.0-1.00.01.02.03.0residual (s)01234567Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude6Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude67Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual6Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual67Distance (degrees)Magnitude Residuals (mB)