Magnitude 3.4, Wed Aug 16 2023 11:11 PM


Download Event Information


Origin


PublicID 2023p614775
UTC Time 2023-08-16T11:11:34Z
Latitude -33.38 (± 49.9 km)
Longitude 179.66 (± 48.0 km)
Depth 247 km (± 115 km)
Depth Type free
Earth Model iasp91
Used Phase Count 11
Used Station Count 8
Standard Error 0.41 (s)
Azimuthal Gap 350.30 (degrees)
Minimum Distance 4.63 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw(mB)) 3.4 (± 0.4)  
mB 4.3 1
Mw(mB) 3.4 (± 0.4) 1
ML 3.7 (± 0.1) 6
MLv 3.8 (± 0.1) 2
M 3.8 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)01234567Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (mB)

Station Magnitudes (ML)


0.01.02.03.04.0Magnitude5Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.03.04.0Magnitude5Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (mB)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (mB)

Magnitude Residuals (ML)


-1.00.01.0Residual5Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual5Distance (degrees)Magnitude Residuals (MLv)