TOURNAI (BE)
Quarry blast9 August 2023
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:00:502023-08-09
- UTC
- 11:00:502023-08-09
Main parameters
| Date and time | 2023-08-09 11:00:50 UTC 2023-08-09 13:00:50 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.669° N, 3.594° E Uncertainty ± 6.3 km |
| Event ID | ROB 20045 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-08-09 18:43:19 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
- 18.2 – 192.1km
- Mean velocity, P wave
- 6.1km/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 0.90 s. S wave: 5 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 | 18.2 | 75 | 11:00:54.19+3.68 s | 11:00:58.08+7.57 s | 3.89 |
| SKQSteenkerque | 34.4 | 94 | 11:00:56.13+5.62 s | 11:01:01.36+10.85 s | 5.23 |
| RQRRonquières | 45.2 | 99 | 11:00:57.44+6.93 s | – | – |
| SNFSeneffe | 51.9 | 110 | 11:00:58.66+8.15 s | 11:01:05.42+14.91 s | 6.76 |
| TGATangissart | 66.0 | 96 | 11:01:01.04+10.53 s | 11:01:08.16+17.65 s | 7.12 |
| DOUDourbes | 95.7 | 132 | 11:01:08.21+17.70 s | 11:01:18.99+28.48 s | 10.78 |
| KLBKalborn | 189.7 | 109 | 11:01:20.60+30.09 s | – | – |
| Bensberg seismic network (University of Cologne, Germany)1 station | |||||
| KLLKalltalsperre | 192.1 | 90 | 11:01:21.76+31.25 s | – | – |