Magnitude 3.1, Tue May 13 2025 6:14 AM


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Origin


PublicID 2025p356115
UTC Time 2025-05-12T18:14:31Z
Latitude -31.54 (± 44.7 km)
Longitude -178.42 (± 63.5 km)
Depth 177 km (± 143 km)
Depth Type free
Earth Model iasp91
Used Phase Count 8
Used Station Count 6
Standard Error 0.43 (s)
Azimuthal Gap 353.61 (degrees)
Minimum Distance 6.93 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.1 (± 0.4)  
MLv 4.6 (± 0.1) 2
mB 4.1 1
Mw(mB) 3.1 (± 0.4) 1
M 4.6 2

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


-5.0-3.0-1.01.03.05.0residual (s)0246810Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude7Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual7Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)