Magnitude 4.7, Wed Jul 15 2020 7:57 AM


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Origin


PublicID 2020p529284
UTC Time 2020-07-14T19:57:11Z
Latitude -28.22 (± 7.9 km)
Longitude -175.20 (± 8.5 km)
Depth 12 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 16
Used Station Count 8
Standard Error 1.42 (s)
Azimuthal Gap 321.27 (degrees)
Minimum Distance 2.60 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 4.7  
MLv 4.9 (± 0.1) 3
mB 4.7 (± 0.1) 4
Mw(mB) 3.9 (± 0.4) 4
M 4.7 4

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)0246810Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude11Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual11Distance (degrees)Magnitude Residuals (mB)