Mulgor Logo EQ at Christchurch at 03:21:42 on 21-Apr-2021

Vertical Velocities recorded at Port Levy

EQ Details

Magnitude: 3.1
Depth: 4 km
Distance: 17 km
Estimated travel time of P waves: 3 s
Estimated travel time of S waves: 5 s

Travel times of P and S waves were derived from this website

Statistics of Signal at Port Levy
Sig. Height μm/s Sig. Period s % of Variance
Raw 68.75 0.189 100.0
T < 1 s 66.25 0.195 99.8
T > 1 s 2.82 1.9 0.2

Significant height and period are derived from a zero-crossing analysis of the wave signal after the arrival time of the p waves.
They are the averages of the highest third of the waves.