Magnitude 1.0, Tue Jun 18 2019 12:35 AM



Download Event Information


Origin


PublicID 2019p452769
UTC Time 2019-06-17T12:35:39Z
Latitude -39.24 (± 5.2 km)
Longitude 175.44 (± 3.6 km)
Depth 9 km (± 9 km)
Depth Type free
Earth Model iasp91
Used Phase Count 13
Used Station Count 9
Standard Error 0.21 (s)
Azimuthal Gap 164.63 (degrees)
Minimum Distance 0.09 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (M) 1.0  
ML 1.0 (± 0.1) 6
MLv 1.0 (± 0.5) 2
M 1.0 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


-1.00.01.0residual (s)0Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Station Magnitudes (MLv)


0.01.02.0Magnitude0Distance (degrees)Station Magnitudes (MLv)

Magnitude Residuals (ML)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (ML)

Magnitude Residuals (MLv)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (MLv)