Magnitude 6.1, Thu Feb 17 2022 9:21 AM


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Origin


PublicID 2022p126620
UTC Time 2022-02-16T20:21:06Z
Latitude -23.77 (± 0.0 km)
Longitude -179.98 (± 0.0 km)
Depth 535 km (± 0 km)
Depth Type free
Earth Model
Used Phase Count 0
Used Station Count 0
Standard Error 2.28 (s)
Azimuthal Gap 0.00 (degrees)
Minimum Distance 0.00 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 6.1 (± 0.1)  
MLv 7.0 (± 0.4) 2
mB 6.1 (± 0.1) 21
Mw(mB) 5.7 (± 0.4) 89

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


-7.0-5.0-3.0-1.01.03.05.07.0residual (s)02468101214161820222426283032Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.07.08.0Magnitude6Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.08.0Magnitude0246810121416182022242628Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual6Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-2.0-1.00.01.02.0Residual0246810121416182022242628Distance (degrees)Magnitude Residuals (mB)