Magnitude 6.8, Sun Aug 3 2025 5:37 PM


Download Event Information


Origin


PublicID 2025p579012
UTC Time 2025-08-03T05:37:55Z
Latitude 50.58 (± 0.0 km)
Longitude 157.80 (± 0.0 km)
Depth 35 km (± 0 km)
Depth Type operator assigned
Earth Model
Used Phase Count 0
Used Station Count 0
Standard Error 1.28 (s)
Azimuthal Gap 0.00 (degrees)
Minimum Distance 0.00 (degrees)

Magnitudes


Type Magnitude Station Count
Preferred (mB) 6.8 (± 0.1)  
mB 6.8 (± 0.1) 27
Mw(mB) 6.6 (± 0.4) 27
M 6.6 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)02468101214161820222426283032343638404244464850525456586062646668707274767880828486889092949698100102104106108110112114116118120122124126128Distance (degrees)Pick Residuals

Station Magnitudes (mB)


0.01.02.03.04.05.06.07.08.0Magnitude024681012141618202224262830323436384042444648505254565860626466687072747678808284868890Distance (degrees)Station Magnitudes (mB)

Magnitude Residuals (mB)


-2.0-1.00.01.02.0Residual024681012141618202224262830323436384042444648505254565860626466687072747678808284868890Distance (degrees)Magnitude Residuals (mB)