Magnitude 5.6, Sat Aug 16 2025 11:49 AM


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Origin


PublicID 2025p613502
UTC Time 2025-08-15T23:49:27Z
Latitude -26.38 (± 8.8 km)
Longitude 152.62 (± 11.9 km)
Depth 5 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 9
Used Station Count 9
Standard Error 1.19 (s)
Azimuthal Gap 189.12 (degrees)
Minimum Distance 7.62 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 5.6 (± 0.1)  
MLv 5.6 1
ML 5.5 1
mB 5.6 (± 0.1) 31
Mw(mB) 5.1 (± 0.4) 31
M 5.1 31

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


-9.0-7.0-5.0-3.0-1.01.03.05.07.09.0residual (s)02468101214161820222426283032343638404244464850Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.03.04.05.06.0MagnitudeDistance (degrees)Station Magnitudes (ML)

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.0Magnitude024681012141618202224Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (ML)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (mB)


-2.0-1.00.01.02.0Residual024681012141618202224Distance (degrees)Magnitude Residuals (mB)