Magnitude 5.5, Fri Jan 10 2020 2:05 PM


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Origin


PublicID 2020p024454
UTC Time 2020-01-10T01:05:40Z
Latitude -21.86 (± 7.3 km)
Longitude -174.43 (± 7.4 km)
Depth 33 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 13
Used Station Count 9
Standard Error 2.65 (s)
Azimuthal Gap 165.63 (degrees)
Minimum Distance 5.04 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 5.5 (± 0.5)  
M 6.1 7
Mw(mB) 5.5 (± 0.5) 7
mB 5.9 (± 0.5) 7
ML 6.5 (± 0.3) 2
MLv 6.6 (± 0.2) 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


-20.0-18.0-16.0-14.0-12.0-10.0-8.0-6.0-4.0-2.00.02.04.06.08.010.012.014.016.018.020.0residual (s)024681012141618202224Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.0Magnitude6810121416Distance (degrees)Station Magnitudes (mB)

Station Magnitudes (ML)


0.01.02.03.04.05.06.07.0Magnitude678Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.05.06.07.0Magnitude678Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual6810121416Distance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (ML)


-1.00.01.0Residual678Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual678Distance (degrees)Magnitude Residuals (MLv)