Magnitude 2.5, Fri Nov 4 2022 5:03 PM


Download Event Information


Origin


PublicID 2022p830187
UTC Time 2022-11-04T04:03:55Z
Latitude -36.82 (± 3.9 km)
Longitude 176.02 (± 5.9 km)
Depth 5 km (± 5 km)
Depth Type free
Earth Model iasp91
Used Phase Count 15
Used Station Count 9
Standard Error 0.30 (s)
Azimuthal Gap 197.42 (degrees)
Minimum Distance 0.25 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 2.5  
ML 2.4 (± 0.4) 6
MLv 2.5 (± 0.3) 7
M 2.5 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


-1.00.01.0residual (s)01Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.0MagnitudeDistance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.0Magnitude1Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (ML)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual1Distance (degrees)Magnitude Residuals (MLv)