M 6.8 Wairarapa II Sun, Aug 2 1942

The shock that struck the Wairarapa Region on 2 August was nearly as severe as the disastrous 24 June earthquake 5 weeks earlier.



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Origin


PublicID 1584854
UTC Time 1942-08-01T12:34:08Z
Latitude -41.01 (± 0.0 km)
Longitude 175.52 (± 0.1 km)
Depth 40 km (± 0 km)
Depth Type operator assigned
Earth Model nz1dr
Used Phase Count 6
Used Station Count 5
Standard Error 0.46 (s)
Azimuthal Gap 182.00 (degrees)
Minimum Distance 0.63 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw) 6.8  
Mw 6.8 0
MS 7.0 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


-1.00.01.0residual (s)0123Distance (degrees)Pick Residuals