TOURNAI (BE)
Quarry blast22 March 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:38:172022-03-22
- UTC
- 11:38:172022-03-22
Main parameters
| Date and time | 2022-03-22 11:38:17 UTC 2022-03-22 12:38:17 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.655° N, 3.445° E Uncertainty ± 3.7 km |
| Event ID | ROB 15705 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-03-25 10:57:47 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
- 44.9 – 199.3km
- Mean velocity, P wave
- 6.3km/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: 6 measurements, root-mean-square deviation 0.39 s. S wave: 5 measurements, root-mean-square deviation 0.31 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 | 44.9 | 91 | 11:38:25.17+8.12 s | 11:38:31.46+14.41 s | 6.29 |
| BRQBracquegnies | 52.7 | 111 | 11:38:26.37+9.32 s | – | – |
| SNFSeneffe | 61.6 | 105 | 11:38:27.17+10.12 s | 11:38:35.69+18.64 s | 8.52 |
| TGATangissart | 76.4 | 94 | 11:38:30.06+13.01 s | 11:38:39.69+22.64 s | 9.63 |
| MRDMaredsous | 101.8 | 112 | 11:38:34.11+17.06 s | 11:38:46.87+29.82 s | 12.76 |
| DOUDourbes | 102.8 | 127 | 11:38:35.06+18.01 s | 11:38:47.50+30.45 s | 12.44 |
| GESGesves | 120.3 | 104 | 11:38:37.68+20.63 s | 11:38:52.58+35.53 s | 14.90 |
| KLBKalborn | 199.3 | 107 | 11:38:47.46+30.41 s | 11:39:12.18+55.13 s | 24.72 |