Magnitude 6.9, Wed May 14 2025 4:15 PM


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Origin


PublicID 2025p359939
UTC Time 2025-05-14T04:15:36Z
Latitude -18.58 (± 7.4 km)
Longitude -175.16 (± 6.7 km)
Depth 229 km (± 22 km)
Depth Type free
Earth Model iasp91
Used Phase Count 9
Used Station Count 7
Standard Error 3.30 (s)
Azimuthal Gap 119.10 (degrees)
Minimum Distance 4.98 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 6.9  
MLv 7.0 (± 0.3) 3
mB 6.9 (± 0.1) 4
Mw(mB) 6.7 (± 0.4) 4
M 6.9 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


-6.0-4.0-2.00.02.04.06.0residual (s)02468101214Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.07.08.0Magnitude56Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.08.0Magnitude6810Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual56Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual6810Distance (degrees)Magnitude Residuals (mB)