Magnitude 3.3, Sun Apr 13 2025 9:49 AM


Download Event Information


Origin


PublicID 2025p275431
UTC Time 2025-04-12T21:49:15Z
Latitude -34.19 (± 45.6 km)
Longitude -179.57 (± 50.4 km)
Depth 276 km (± 65 km)
Depth Type free
Earth Model iasp91
Used Phase Count 10
Used Station Count 8
Standard Error 0.70 (s)
Azimuthal Gap 349.58 (degrees)
Minimum Distance 3.98 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.3 (± 0.4)  
MLv 3.7 1
mB 4.2 1
Mw(mB) 3.3 (± 0.4) 1
M 3.7 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


-3.0-2.0-1.00.01.02.03.0residual (s)0123456Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)