Magnitude 3.5, Sat Feb 17 2024 12:15 PM


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Origin


PublicID 2024p126945
UTC Time 2024-02-16T23:15:18Z
Latitude -34.37 (± 42.9 km)
Longitude 178.96 (± 53.3 km)
Depth 244 km (± 67 km)
Depth Type free
Earth Model iasp91
Used Phase Count 10
Used Station Count 8
Standard Error 0.55 (s)
Azimuthal Gap 348.03 (degrees)
Minimum Distance 3.51 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (MLv) 3.5 (± 0.2)  
mB 5.0 1
Mw(mB) 4.3 (± 0.4) 1
MLv 3.5 (± 0.2) 7
M 3.5 7

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


-4.0-3.0-2.0-1.00.01.02.03.04.0residual (s)0123456789Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.06.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Station Magnitudes (MLv)


0.01.02.03.04.05.0Magnitude456Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual456Distance (degrees)Magnitude Residuals (MLv)