Magnitude 3.0, Thu Nov 9 2017 2:29 AM


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Origin


PublicID 2017p842060
UTC Time 2017-11-08T13:29:35Z
Latitude -44.89 (± 5.7 km)
Longitude 167.38 (± 7.9 km)
Depth 21 km (± 9 km)
Depth Type free
Earth Model iasp91
Used Phase Count 11
Used Station Count 7
Standard Error 0.44 (s)
Azimuthal Gap 215.70 (degrees)
Minimum Distance 0.45 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (ML) 3.0 (± 0.3)  
ML 3.0 (± 0.3) 7

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


-25.0-23.0-21.0-19.0-17.0-15.0-13.0-11.0-9.0-7.0-5.0-3.0-1.01.03.05.07.09.011.013.015.017.019.021.023.025.0residual (s)01234Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.0Magnitude1Distance (degrees)Station Magnitudes (ML)

Magnitude Residuals (ML)


-1.00.01.0Residual1Distance (degrees)Magnitude Residuals (ML)