Magnitude 4.1, Fri Mar 14 2025 10:49 AM


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Origin


PublicID 2025p194355
UTC Time 2025-03-13T21:49:15Z
Latitude -21.96 (± 11.0 km)
Longitude -179.92 (± 66.5 km)
Depth 152 km (± 47 km)
Depth Type free
Earth Model iasp91
Used Phase Count 9
Used Station Count 6
Standard Error 0.82 (s)
Azimuthal Gap 336.25 (degrees)
Minimum Distance 7.49 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 4.1 (± 0.3)  
MLv 5.2 1
mB 4.1 (± 0.3) 3
Mw(mB) 3.1 (± 0.4) 3
M 5.0 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


-4.0-3.0-2.0-1.00.01.02.03.04.0residual (s)02468101214161820Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude1820Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual1820Distance (degrees)Magnitude Residuals (mB)