Magnitude 2.1, Thu Mar 27 2025 9:23 PM


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Origin


PublicID 2025p230675
UTC Time 2025-03-27T08:23:42Z
Latitude -36.29 (± 22.1 km)
Longitude 177.38 (± 22.0 km)
Depth 252 km (± 21 km)
Depth Type free
Earth Model iasp91
Used Phase Count 11
Used Station Count 9
Standard Error 0.27 (s)
Azimuthal Gap 261.25 (degrees)
Minimum Distance 1.41 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (MLv) 2.1 (± 0.1)  
MLv 2.1 (± 0.1) 3
M 2.1 3

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


-1.00.01.0residual (s)012Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.0Magnitude2Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (MLv)


-1.00.01.0Residual2Distance (degrees)Magnitude Residuals (MLv)