Magnitude 4.6, Mon Sep 5 2022 12:23 PM


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Origin


PublicID 2022p667620
UTC Time 2022-09-05T00:23:37Z
Latitude -30.09 (± 33.4 km)
Longitude -177.85 (± 83.1 km)
Depth 237 km (± 19 km)
Depth Type free
Earth Model iasp91
Used Phase Count 12
Used Station Count 9
Standard Error 0.69 (s)
Azimuthal Gap 204.92 (degrees)
Minimum Distance 0.83 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 4.6  
MLv 3.6 1
mB 4.6 1
Mw(mB) 3.8 (± 0.4) 2
M 3.6 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


-12.0-10.0-8.0-6.0-4.0-2.00.02.04.06.08.010.012.0residual (s)024681012Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)