Magnitude 4.3, Wed Mar 27 2019 7:28 PM


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Origin


PublicID 2019p230458
UTC Time 2019-03-27T06:28:13Z
Latitude -30.73 (± 31.4 km)
Longitude -179.03 (± 63.7 km)
Depth 33 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 12
Used Station Count 9
Standard Error 0.47 (s)
Azimuthal Gap 191.14 (degrees)
Minimum Distance 1.75 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (MLv) 4.3 (± 0.3)  
MLv 4.3 (± 0.3) 3
ML 4.9 (± 0.2) 4
mB 4.9 1
Mw(mB) 4.1 (± 0.4) 1
M 4.3 3

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


-10.0-8.0-6.0-4.0-2.00.02.04.06.08.010.0residual (s)012345678Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude234567Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.03.04.05.06.0Magnitude234567Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (mB)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual234567Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual234567Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)