Magnitude 0.8, Sun Dec 17 2023 4:54 PM


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Origin


PublicID 2023p946383
UTC Time 2023-12-17T03:54:12Z
Latitude -39.21 (± 29.3 km)
Longitude 175.46 (± 43.6 km)
Depth 13 km (± 40 km)
Depth Type free
Earth Model nz3drx
Used Phase Count 8
Used Station Count 8
Standard Error 0.37 (s)
Azimuthal Gap 252.75 (degrees)
Minimum Distance 0.08 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 0.8  
MLv 0.8 (± 0.3) 4
M 0.8 4

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


-27.0-25.0-23.0-21.0-19.0-17.0-15.0-13.0-11.0-9.0-7.0-5.0-3.0-1.01.03.05.07.09.011.013.015.017.019.021.023.025.027.0residual (s)012Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)