CELLES (BE)
Quarry blast4 July 2022
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:29:372022-07-04
- UTC
- 10:29:372022-07-04
Main parameters
| Date and time | 2022-07-04 10:29:37 UTC 2022-07-04 12:29:37 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.695° N, 3.416° E Uncertainty ± 7.0 km |
| Event ID | ROB 16560 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-07-04 14:17:31 Belgian time
Location map
- Epicentre
- Station that recorded the event
Arrival times at the stations
Each station first records the P wave, the fastest, then the S wave. The farther a station is from the epicentre, the later the waves reach it and the wider the gap between the two.
- Stations
- 6
- Epicentral distance
- 30.2 – 123.3km
- Mean velocity, P wave
- 5.5km/s
- Mean velocity, S wave
- 3.2km/s
- P wave
- S wave
- Curve fitted to the measurements
Notes and method
Curves: travel time of a direct wave in a homogeneous medium. The velocity of each wave and an origin-time shift, common to both, are fitted to the measurements by least squares. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 5 measurements, root-mean-square deviation 0.83 s. S wave: 5 measurements, root-mean-square deviation 1.26 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
Station measurements
P- and S-wave arrivals and ground displacement measured at each station. Click a column heading to change the order.
| km | ° | UTC | UTC | s | |
|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)6 stations | |||||
| LESLessines | 30.2 | 86 | 10:29:42.72+5.65 s | 10:29:46.69+9.62 s | 3.97 |
| SKQSteenkerque | 47.2 | 96 | 10:29:44.04+6.97 s | 10:29:50.39+13.32 s | 6.35 |
| SNFSeneffe | 64.7 | 108 | 10:29:47.50+10.43 s | 10:29:55.37+18.30 s | 7.87 |
| MRDMaredsous | 105.4 | 114 | 10:29:56.63+19.56 s | 10:30:10.89+33.82 s | 14.26 |
| DOUDourbes | 107.1 | 128 | 10:29:55.36+18.29 s | 10:30:08.14+31.07 s | 12.78 |
| GESGesves | 123.3 | 106 | 10:29:58.57+21.50 s | 10:30:13.15+36.08 s | 14.58 |