Magnitude 5.1, Tue Oct 10 2023 11:16 PM


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Origin


PublicID 2023p763328
UTC Time 2023-10-10T10:16:54Z
Latitude -29.41 (± 51.5 km)
Longitude -176.99 (± 92.7 km)
Depth 72 km (± 112 km)
Depth Type free
Earth Model iasp91
Used Phase Count 7
Used Station Count 6
Standard Error 0.62 (s)
Azimuthal Gap 282.47 (degrees)
Minimum Distance 0.82 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 5.1 (± 0.2)  
mB 5.1 (± 0.2) 3
ML 4.7 (± 0.3) 2
MLv 4.6 (± 0.1) 2
Mw(mB) 4.4 (± 0.4) 0
M 4.6 2

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


-7.0-5.0-3.0-1.01.03.05.07.0residual (s)024681012Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.06.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Station Magnitudes (ML)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (ML)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)