TOURNAI (BE)
Quarry blast25 April 2022
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:46:172022-04-25
- UTC
- 10:46:172022-04-25
Main parameters
| Date and time | 2022-04-25 10:46:17 UTC 2022-04-25 12:46:17 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.624° N, 3.416° E Uncertainty ± 2.1 km |
| Event ID | ROB 15990 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-25 16:03:01 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
- 8
- Epicentral distance
- 47.1 – 200.3km
- Mean velocity, P wave
- 6.2km/s
- Mean velocity, S wave
- 3.5km/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 0.13 s. S wave: 4 measurements, root-mean-square deviation 0.24 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)8 stations | |||||
| SKQSteenkerque | 47.1 | 86 | 10:46:25.47+8.33 s | 10:46:31.52+14.38 s | 6.05 |
| SNFSeneffe | 62.8 | 101 | 10:46:28.27+11.13 s | 10:46:36.15+19.01 s | 7.88 |
| TGATangissart | 78.3 | 91 | 10:46:30.80+13.66 s | 10:46:40.01+22.87 s | 9.21 |
| MRDMaredsous | 102.5 | 110 | 10:46:34.39+17.25 s | – | – |
| DOUDourbes | 102.5 | 125 | 10:46:34.51+17.37 s | 10:46:47.54+30.40 s | 13.03 |
| GESGesves | 121.5 | 102 | 10:46:38.14+21.00 s | 10:46:52.78+35.64 s | 14.64 |
| CLAClavier | 135.7 | 99 | 10:46:40.16+23.02 s | – | – |
| KLBKalborn | 200.3 | 106 | 10:46:48.40+31.26 s | 10:47:12.67+55.53 s | 24.27 |