TOURNAI (BE)
Quarry blast11 August 2022
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:00:022022-08-11
- UTC
- 11:00:022022-08-11
Main parameters
| Date and time | 2022-08-11 11:00:02 UTC 2022-08-11 13:00:02 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.643° N, 3.465° E Uncertainty ± 21.2 km |
| Event ID | ROB 16795 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-11 23:26:53 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
- 27.8 – 132.6km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/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 0.53 s. S wave: 5 measurements, root-mean-square deviation 0.94 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 | |||||
| LESLessines | 27.8 | 74 | 11:00:06.81+4.50 s | 11:00:11.65+9.34 s | 4.84 |
| SKQSteenkerque | 43.5 | 89 | 11:00:09.93+7.62 s | 11:00:15.16+12.85 s | 5.23 |
| RQRRonquières | 53.9 | 94 | 11:00:11.53+9.22 s | – | – |
| SNFSeneffe | 59.9 | 104 | 11:00:12.39+10.08 s | 11:00:19.72+17.41 s | 7.33 |
| MRDMaredsous | 100.0 | 112 | 11:00:20.16+17.85 s | – | – |
| DOUDourbes | 100.9 | 127 | 11:00:20.20+17.89 s | 11:00:31.76+29.45 s | 11.56 |
| GESGesves | 118.6 | 103 | 11:00:21.64+19.33 s | 11:00:39.51+37.20 s | 17.87 |
| CLAClavier | 132.6 | 100 | 11:00:25.78+23.47 s | – | – |