M 4.6 Waiotapu, Thu, Dec 15 1983

This earthquake reached its greatest intensities around Waiotapu and the Waikite Valley.

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PublicID 1564800
UTC Time 1983-12-14T20:56:29Z
Latitude -38.36 (± 0.0 km)
Longitude 176.33 (± 0.0 km)
Depth 5 km (± 0 km)
Depth Type operator assigned
Earth Model nz1d
Used Phase Count 7
Used Station Count 7
Standard Error 0.50 (s)
Azimuthal Gap 109.00 (degrees)
Minimum Distance 0.64 (degrees)


Type Magnitude Station Count
Preferred (MS) 4.6  
ML 5.1 (± 0.3) 6
MS 4.6 0

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

- (s)01Distance (degrees)Pick Residuals

Station Magnitudes (ML) (degrees)Station Magnitudes (ML)

Magnitude Residuals (ML)

- (degrees)Magnitude Residuals (ML)