Magnitude 3.3, Wed Jan 31 2024 11:31 PM


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Origin


PublicID 2024p082269
UTC Time 2024-01-31T10:31:55Z
Latitude -31.72 (± 42.0 km)
Longitude -179.23 (± 118.9 km)
Depth 263 km (± 36 km)
Depth Type free
Earth Model iasp91
Used Phase Count 9
Used Station Count 7
Standard Error 0.87 (s)
Azimuthal Gap 180.29 (degrees)
Minimum Distance 2.70 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.3 (± 0.4)  
mB 4.2 (± 0.2) 5
Mw(mB) 3.3 (± 0.4) 1
MLv 4.3 (± 0.2) 4
M 4.3 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


-5.0-3.0-1.01.03.05.0residual (s)024681012Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude810Distance (degrees)Station Magnitudes (mB)

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude34567Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual810Distance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual34567Distance (degrees)Magnitude Residuals (MLv)