Magnitude 4.4, Fri Dec 2 2022 2:28 AM


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Origin


PublicID 2022p904222
UTC Time 2022-12-01T13:28:02Z
Latitude -30.21 (± 33.0 km)
Longitude 179.71 (± 106.0 km)
Depth 293 km (± 82 km)
Depth Type free
Earth Model iasp91
Used Phase Count 11
Used Station Count 9
Standard Error 1.21 (s)
Azimuthal Gap 228.93 (degrees)
Minimum Distance 2.27 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 4.4 (± 0.1)  
MLv 4.7 1
mB 4.4 (± 0.1) 7
Mw(mB) 3.6 (± 0.4) 1

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


-4.0-3.0-2.0-1.00.01.02.03.04.0residual (s)0246810Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude810Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual810Distance (degrees)Magnitude Residuals (mB)