Magnitude 5.4, Thu Sep 3 2020 9:39 AM


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Origin


PublicID 2020p664605
UTC Time 2020-09-02T21:39:00Z
Latitude -24.05 (± 12.4 km)
Longitude -179.25 (± 17.1 km)
Depth 558 km (± 14 km)
Depth Type free
Earth Model iasp91
Used Phase Count 12
Used Station Count 9
Standard Error 0.91 (s)
Azimuthal Gap 214.56 (degrees)
Minimum Distance 5.31 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 5.4  
MLv 5.4 (± 0.2) 2
mB 5.3 1
Mw(mB) 4.7 (± 0.4) 1
M 5.4 2

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)0246810121416Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.06.0MagnitudeDistance (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)