Magnitude 4.1, Mon Nov 14 2016 12:28 AM


Download Event Information


Origin


PublicID 2016p858049
UTC Time 2016-11-13T11:28:17Z
Latitude -41.87 (± 3.1 km)
Longitude 174.19 (± 3.3 km)
Depth 5 km (± 0 km)
Depth Type operator assigned
Earth Model iasp91
Used Phase Count 15
Used Station Count 9
Standard Error 0.91 (s)
Azimuthal Gap 160.04 (degrees)
Minimum Distance 0.05 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 4.1  
MLv 4.1 (± 0.6) 3
ML 4.4 (± 0.4) 3
M 4.1 3

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


-7.0-5.0-3.0-1.01.03.05.07.0residual (s)0Distance (degrees)Pick Residuals

Station Magnitudes (MLv)


0.01.02.03.04.05.0MagnitudeDistance (degrees)Station Magnitudes (MLv)

Station Magnitudes (ML)


0.01.02.03.04.05.0MagnitudeDistance (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)