Magnitude 4.5, Thu Jul 14 2022 1:31 PM


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Origin


PublicID 2022p524499
UTC Time 2022-07-14T01:31:52Z
Latitude -30.45 (± 24.4 km)
Longitude -179.92 (± 69.8 km)
Depth 206 km (± 54 km)
Depth Type free
Earth Model iasp91
Used Phase Count 14
Used Station Count 9
Standard Error 1.07 (s)
Azimuthal Gap 218.31 (degrees)
Minimum Distance 2.10 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 4.5 (± 0.3)  
mB 4.5 (± 0.3) 2
Mw(mB) 3.6 (± 0.4) 1
MLv 4.9 (± 0.3) 5
M 4.9 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


-6.0-4.0-2.00.02.04.06.0residual (s)0246810Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude8Distance (degrees)Station Magnitudes (mB)

Station Magnitudes (MLv)


0.01.02.03.04.05.06.0Magnitude345678Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual8Distance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual345678Distance (degrees)Magnitude Residuals (MLv)