TOURNAI (BE)
Quarry blast29 September 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:192022-09-29
- UTC
- 11:00:192022-09-29
Main parameters
| Date and time | 2022-09-29 11:00:19 UTC 2022-09-29 13:00:19 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.664° N, 3.425° E Uncertainty ± 10.2 km |
| Event ID | ROB 17480 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-10-27 13:02:51 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
- 30.0 – 204.1km
- 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 0.36 s. S wave: 4 measurements, root-mean-square deviation 1.21 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)7 stations | |||||
| LESLessines | 30.0 | 80 | 11:00:25.19+6.05 s | 11:00:28.75+9.61 s | 3.56 |
| SKQSteenkerque | 46.3 | 92 | 11:00:26.94+7.80 s | 11:00:32.49+13.35 s | 5.55 |
| RQRRonquières | 56.9 | 96 | 11:00:28.63+9.49 s | – | – |
| MRDMaredsous | 103.5 | 112 | 11:00:36.27+17.13 s | 11:00:51.98+32.84 s | 15.71 |
| DOUDourbes | 104.6 | 127 | 11:00:36.82+17.68 s | 11:00:49.14+30.00 s | 12.32 |
| GESGesves | 121.9 | 104 | 11:00:40.97+21.83 s | – | – |
| CLAClavier | 135.8 | 101 | 11:00:41.31+22.17 s | – | – |
| Bensberg seismic network (University of Cologne, Germany)1 station | |||||
| KLLKalltalsperre | 204.1 | 89 | 11:00:52.76+33.62 s | 11:01:14.34+55.20 s | 21.58 |