Magnitude 2.2, Thu Nov 16 2023 8:23 AM


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Origin


PublicID 2023p861643
UTC Time 2023-11-15T19:23:27Z
Latitude -38.29 (± 13.5 km)
Longitude 176.07 (± 21.6 km)
Depth 152 km (± 14 km)
Depth Type free
Earth Model iasp91
Used Phase Count 12
Used Station Count 9
Standard Error 0.28 (s)
Azimuthal Gap 272.33 (degrees)
Minimum Distance 0.78 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (MLv) 2.2 (± 0.7)  
ML 2.0 (± 0.7) 3
MLv 2.2 (± 0.7) 5

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


-3.0-2.0-1.00.01.02.03.0residual (s)0123Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.0Magnitude12Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.0Magnitude123Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual12Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-2.0-1.00.01.02.0Residual123Distance (degrees)Magnitude Residuals (MLv)