Magnitude 4.8, Fri Jul 28 2017 6:56 PM


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Origin


PublicID 2017p562951
UTC Time 2017-07-28T06:56:18Z
Latitude -16.14 (± 0.0 km)
Longitude 167.99 (± 0.0 km)
Depth 167 km (± 0 km)
Depth Type free
Earth Model
Used Phase Count 0
Used Station Count 0
Standard Error 1.43 (s)
Azimuthal Gap 0.00 (degrees)
Minimum Distance 0.00 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mb) 4.8 (± 0.1)  
mb 4.8 (± 0.1) 27

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)0246810121416182022242628Distance (degrees)Pick Residuals

Station Magnitudes (mb)


0.01.02.03.04.05.06.0Magnitude2022242628Distance (degrees)Station Magnitudes (mb)

Magnitude Residuals (mb)


-1.00.01.0Residual2022242628Distance (degrees)Magnitude Residuals (mb)