TOURNAI (BE)
Quarry blast18 August 2022
- Magnitude
- 1.5ML
- Depth
- –
- Belgian time
- 12:30:332022-08-18
- UTC
- 10:30:332022-08-18
Main parameters
| Date and time | 2022-08-18 10:30:33 UTC 2022-08-18 12:30:33 Belgian time |
|---|---|
| Magnitude | ML 1.5 |
| Epicentral coordinates | 50.593° N, 3.546° E Uncertainty ± 5.0 km |
| Event ID | ROB 16860 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-18 15:17:08 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
- 9
- Epicentral distance
- 24.7 – 190.5km
- Mean velocity, P wave
- 5.8km/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: 8 measurements, root-mean-square deviation 0.27 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)9 stations | |||||
| LESLessines | 24.7 | 58 | 10:30:37.83+4.56 s | 10:30:41.31+8.04 s | 3.48 |
| SKQSteenkerque | 38.3 | 81 | 10:30:39.76+6.49 s | – | – |
| BRQBracquegnies | 43.6 | 106 | 10:30:40.99+7.72 s | – | – |
| RQRRonquières | 48.1 | 88 | 10:30:41.30+8.03 s | – | – |
| SNFSeneffe | 53.1 | 100 | 10:30:42.20+8.93 s | – | – |
| MRDMaredsous | 92.6 | 110 | 10:30:49.77+16.50 s | – | – |
| DOUDourbes | 93.0 | 126 | 10:30:49.48+16.21 s | – | – |
| GESGesves | 111.8 | 101 | 10:30:52.31+19.04 s | – | – |
| KLBKalborn | 190.5 | 106 | 10:31:04.18+30.91 s | – | – |