M 5.9 Lake Tennyson Sat, Feb 10 1990

This earthquake occurred in North Canterbury near Lake Tennyson.



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Origin


PublicID 97781
UTC Time 1990-02-10T03:27:41Z
Latitude -42.25 (± 0.0 km)
Longitude 172.65 (± 0.0 km)
Depth 13 km (± 4 km)
Depth Type free
Earth Model nz1dr
Used Phase Count 20
Used Station Count 17
Standard Error 0.22 (s)
Azimuthal Gap 130.00 (degrees)
Minimum Distance 0.46 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (Mw) 5.9  
ML 5.8 (± 0.3) 12
MS 6.0 0
Mw 5.9 0

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)0123456Distance (degrees)Pick Residuals

Station Magnitudes (ML)


0.01.02.03.04.05.06.07.0Magnitude0Distance (degrees)Station Magnitudes (ML)

Magnitude Residuals (ML)


-1.00.01.0Residual0Distance (degrees)Magnitude Residuals (ML)