Magnitude 6.2, Sun Jun 16 2019 10:55 AM


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Origin


PublicID 2019p448551
UTC Time 2019-06-15T22:55:01Z
Latitude -30.48 (± 39.5 km)
Longitude -179.98 (± 124.0 km)
Depth 33 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 8
Used Station Count 4
Standard Error 1.85 (s)
Azimuthal Gap 357.39 (degrees)
Minimum Distance 10.47 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 6.2  
mB 6.5 (± 0.2) 13
Mw(mB) 6.2 (± 0.4) 13
M 6.2 13

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


-6.0-4.0-2.00.02.04.06.0residual (s)0246810Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.08.0Magnitude11Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (mB)


-1.00.01.0Residual11Distance (degrees)Magnitude Residuals (mB)