Magnitude 2.9, Sun May 14 2023 9:22 AM


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Origin


PublicID 2023p359164
UTC Time 2023-05-13T21:22:44Z
Latitude -45.22 (± 12.8 km)
Longitude 167.37 (± 13.0 km)
Depth 96 km (± 15 km)
Depth Type free
Earth Model iasp91
Used Phase Count 9
Used Station Count 8
Standard Error 0.47 (s)
Azimuthal Gap 184.31 (degrees)
Minimum Distance 0.29 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 2.9  
MLv 2.9 1
M 2.9 1

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 (MLv)


0.01.02.03.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)