Magnitude 4.9, Sat Jan 12 2019 11:35 PM



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Origin


PublicID 2019p030926
UTC Time 2019-01-12T10:35:19Z
Latitude -32.61 (± 74.4 km)
Longitude 178.38 (± 221.3 km)
Depth 516 km (± 108 km)
Depth Type free
Earth Model iasp91
Used Phase Count 7
Used Station Count 6
Standard Error 0.16 (s)
Azimuthal Gap 354.42 (degrees)
Minimum Distance 4.95 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 4.9  
M 4.9 6
MLv 4.9 (± 0.1) 6
Mw(mB) 3.6 (± 0.4) 2
mB 4.5 (± 0.0) 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


-86.0-84.0-82.0-80.0-78.0-76.0-74.0-72.0-70.0-68.0-66.0-64.0-62.0-60.0-58.0-56.0-54.0-52.0-50.0-48.0-46.0-44.0-42.0-40.0-38.0-36.0-34.0-32.0-30.0-28.0-26.0-24.0-22.0-20.0-18.0-16.0-14.0-12.0-10.0-8.0-6.0-4.0-2.00.02.04.06.08.010.012.014.016.018.020.022.024.026.028.030.032.034.036.038.040.042.044.046.048.050.052.054.056.058.060.062.064.066.068.070.072.074.076.078.080.082.084.086.0residual (s)0123456Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.0Magnitude0Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude0Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (mB)