Magnitude 3.8, Mon Apr 11 2022 12:21 PM


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Origin


PublicID 2022p270311
UTC Time 2022-04-11T00:21:04Z
Latitude -34.79 (± 18.1 km)
Longitude 179.84 (± 38.1 km)
Depth 300 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 11
Used Station Count 8
Standard Error 0.94 (s)
Azimuthal Gap 335.15 (degrees)
Minimum Distance 3.40 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (MLv) 3.8 (± 0.4)  
ML 3.6 (± 0.5) 3
MLv 3.8 (± 0.4) 3
M 3.8 3

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)01234567Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.05.0Magnitude45Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude4Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual45Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual4Distance (degrees)Magnitude Residuals (MLv)