Magnitude 3.4, Thu May 24 1979 8:36 AM


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Origin


PublicID 1560046
UTC Time 1979-05-23T20:36:29Z
Latitude -45.17 (± 0.0 km)
Longitude 167.57 (± 0.1 km)
Depth 12 km (± 0 km)
Depth Type operator assigned
Earth Model nz1d
Used Phase Count 12
Used Station Count 8
Standard Error 0.80 (s)
Azimuthal Gap 219.00 (degrees)
Minimum Distance 0.56 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (ML) 3.4 (± 0.4)  
ML 3.4 (± 0.4) 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


-2.0-1.00.01.02.0residual (s)012Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.05.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Magnitude Residuals (ML)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (ML)