Magnitude 4.0, Fri Oct 25 2024 2:52 AM


Download Event Information


Origin


PublicID 2024p804267
UTC Time 2024-10-24T13:52:13Z
Latitude -28.25 (± 24.1 km)
Longitude -178.83 (± 77.9 km)
Depth 600 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 11
Used Station Count 8
Standard Error 1.00 (s)
Azimuthal Gap 347.65 (degrees)
Minimum Distance 9.81 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 4.0 (± 0.0)  
mB 4.0 (± 0.0) 2
Mw(mB) 3.0 (± 0.4) 2

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


-3.0-2.0-1.00.01.02.03.0residual (s)024681012Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0Magnitude10Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (mB)


-1.00.01.0Residual10Distance (degrees)Magnitude Residuals (mB)