TOURNAI (BE)
Quarry blast16 August 2022
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:00:072022-08-16
- UTC
- 11:00:072022-08-16
Main parameters
| Date and time | 2022-08-16 11:00:07 UTC 2022-08-16 13:00:07 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.637° N, 3.367° E Uncertainty ± 7.3 km |
| Event ID | ROB 16830 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-17 09:51:30 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
- 50.5 – 204.0km
- Mean velocity, P wave
- 6.2km/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: 5 measurements, root-mean-square deviation 0.30 s. S wave: 4 measurements, root-mean-square deviation 0.77 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 | 50.5 | 88 | 11:00:16.07+8.82 s | 11:00:22.22+14.97 s | 6.15 |
| BRQBracquegnies | 57.2 | 107 | 11:00:17.50+10.25 s | – | – |
| SNFSeneffe | 66.5 | 102 | 11:00:18.45+11.20 s | 11:00:28.72+21.47 s | 10.27 |
| TGATangissart | 81.8 | 92 | 11:00:21.06+13.81 s | 11:00:31.64+24.39 s | 10.58 |
| DOUDourbes | 106.1 | 124 | 11:00:25.69+18.44 s | 11:00:38.41+31.16 s | 12.72 |
| GESGesves | 125.2 | 102 | 11:00:28.51+21.26 s | 11:00:43.90+36.65 s | 15.39 |
| RCHRochefort | 142.7 | 111 | 11:00:30.07+22.82 s | – | – |
| KLBKalborn | 204.0 | 106 | 11:00:40.50+33.25 s | – | – |