Magnitude 0.9, Mon Apr 24 2017 4:21 PM


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Origin


PublicID 2017p305896
UTC Time 2017-04-24T04:21:53Z
Latitude -38.92 (± 1.3 km)
Longitude 175.70 (± 2.8 km)
Depth 6 km (± 2 km)
Depth Type free
Earth Model nz3drx
Used Phase Count 12
Used Station Count 7
Standard Error 0.21 (s)
Azimuthal Gap 200.56 (degrees)
Minimum Distance 0.06 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 0.9  
MLv 0.9 (± 0.3) 5
ML 1.2 (± 0.2) 7
M 0.9 5

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


-15.0-13.0-11.0-9.0-7.0-5.0-3.0-1.01.03.05.07.09.011.013.015.0residual (s)0123Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.0MagnitudeDistance (degrees)Station Magnitudes (ML)

Magnitude Residuals (MLv)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (MLv)

Magnitude Residuals (ML)


-1.00.01.0ResidualDistance (degrees)Magnitude Residuals (ML)