Magnitude 3.0, Thu May 8 2025 7:47 AM


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Origin


PublicID 2025p342771
UTC Time 2025-05-07T19:47:29Z
Latitude -33.14 (± 32.1 km)
Longitude -178.55 (± 53.7 km)
Depth 200 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 13
Used Station Count 8
Standard Error 0.56 (s)
Azimuthal Gap 353.54 (degrees)
Minimum Distance 5.29 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.0 (± 0.4)  
mB 4.0 (± 0.1) 4
Mw(mB) 3.0 (± 0.4) 4
MLv 3.9 (± 0.3) 4
M 3.7 4

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)01234567Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude6Distance (degrees)Station Magnitudes (mB)

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude6Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual6Distance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual6Distance (degrees)Magnitude Residuals (MLv)