Magnitude 4.5, Thu Apr 24 2025 1:01 PM


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Origin


PublicID 2025p305525
UTC Time 2025-04-24T01:01:32Z
Latitude -25.64 (± 18.6 km)
Longitude -178.10 (± 27.7 km)
Depth 300 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 10
Used Station Count 8
Standard Error 0.76 (s)
Azimuthal Gap 214.08 (degrees)
Minimum Distance 9.99 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 4.5 (± 0.3)  
mB 4.5 (± 0.3) 4
Mw(mB) 3.6 (± 0.4) 4
M 3.6 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)02468101214Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude13Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (mB)


-1.00.01.0Residual13Distance (degrees)Magnitude Residuals (mB)