TOURNAI (BE)
Quarry blast24 January 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:082022-01-24
- UTC
- 12:00:082022-01-24
Main parameters
| Date and time | 2022-01-24 12:00:08 UTC 2022-01-24 13:00:08 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.627° N, 3.455° E Uncertainty ± 2.1 km |
| Event ID | ROB 15260 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-01-24 14:24:23 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
- 11
- Epicentral distance
- 29.0 – 197.7km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.4km/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: 7 measurements, root-mean-square deviation 0.23 s. S wave: 6 measurements, root-mean-square deviation 0.27 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)10 stations | |||||
| LESLessines | 29.0 | 71 | 12:00:14.26+5.35 s | 12:00:18.23+9.32 s | 3.97 |
| SKQSteenkerque | 44.3 | 87 | 12:00:16.26+7.35 s | 12:00:22.00+13.09 s | 5.74 |
| BRQBracquegnies | 50.9 | 108 | 12:00:17.56+8.65 s | – | – |
| SNFSeneffe | 60.1 | 102 | 12:00:18.77+9.86 s | 12:00:26.98+18.07 s | 8.21 |
| MRDMaredsous | 100.0 | 111 | 12:00:25.68+16.77 s | 12:00:38.97+30.06 s | 13.29 |
| DOUDourbes | 100.4 | 126 | 12:00:26.06+17.15 s | 12:00:38.59+29.68 s | 12.53 |
| GESGesves | 118.9 | 102 | 12:00:28.82+19.91 s | 12:00:44.02+35.11 s | 15.20 |
| CLAClavier | 133.0 | 99 | 12:00:32.12+23.21 s | 12:00:49.57+40.66 s | 17.45 |
| RCHRochefort | 136.5 | 112 | 12:00:32.38+23.47 s | 12:00:49.00+40.09 s | 16.62 |
| KLBKalborn | 197.7 | 106 | 12:00:40.65+31.74 s | 12:01:04.29+55.38 s | 23.64 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 175.6 | 84 | 12:00:37.96+29.05 s | 12:00:58.58+49.67 s | 20.62 |