Magnitude 3.5, Fri May 16 2025 8:06 AM


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Origin


PublicID 2025p364427
UTC Time 2025-05-15T20:06:28Z
Latitude -35.17 (± 25.5 km)
Longitude 178.68 (± 26.8 km)
Depth 140 km (± 58 km)
Depth Type free
Earth Model iasp91
Used Phase Count 15
Used Station Count 8
Standard Error 0.27 (s)
Azimuthal Gap 342.77 (degrees)
Minimum Distance 2.41 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (MLv) 3.5 (± 0.2)  
MLv 3.5 (± 0.2) 9
M 3.5 9

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


-8.0-6.0-4.0-2.00.02.04.06.08.0residual (s)012345678Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.0Magnitude3456Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (MLv)


-1.00.01.0Residual3456Distance (degrees)Magnitude Residuals (MLv)