Magnitude 7.1, Mon May 27 2024 8:47 AM


Download Event Information


Origin


PublicID 2024p396935
UTC Time 2024-05-26T20:47:08Z
Latitude -19.20 (± 8.1 km)
Longitude -174.19 (± 14.9 km)
Depth 270 km (± 45 km)
Depth Type free
Earth Model iasp91
Used Phase Count 7
Used Station Count 5
Standard Error 2.19 (s)
Azimuthal Gap 109.18 (degrees)
Minimum Distance 4.03 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 7.1  
MLv 7.4 (± 0.3) 2
mB 6.6 (± 0.1) 4
Mw(mB) 6.3 (± 0.4) 4
M 7.1 4

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)0246810Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.06.07.08.0Magnitude5Distance (degrees)Station Magnitudes (MLv)

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.0Magnitude6810Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (MLv)


-1.00.01.0Residual5Distance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (mB)


-1.00.01.0Residual6810Distance (degrees)Magnitude Residuals (mB)