Magnitude 3.3, Sun Nov 4 1979 10:34 AM


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Origin


PublicID 1682344
UTC Time 1979-11-03T21:34:56Z
Latitude -40.50 (± 0.1 km)
Longitude 174.87 (± 0.0 km)
Depth 25 km (± 2 km)
Depth Type free
Earth Model nz1d
Used Phase Count 9
Used Station Count 8
Standard Error 0.20 (s)
Azimuthal Gap 314.00 (degrees)
Minimum Distance 0.37 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (ML) 3.3  
ML 3.3 1
Md 3.6 (± 0.1) 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)0Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (Md)


0.01.02.03.04.0Magnitude0Distance (degrees)Station Magnitudes (Md)

Magnitude Residuals (ML)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (Md)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (Md)