TOURNAI (BE)
Quarry blast12 December 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 15:31:472022-12-12
- UTC
- 14:31:472022-12-12
Main parameters
| Date and time | 2022-12-12 14:31:47 UTC 2022-12-12 15:31:47 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.658° N, 3.451° E Uncertainty ± 9.5 km |
| Event ID | ROB 18025 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-16 11:28:38 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
- 12
- Epicentral distance
- 28.3 – 199.0km
- Mean velocity, P wave
- 5.6km/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: 9 measurements, root-mean-square deviation 0.76 s. S wave: 6 measurements, root-mean-square deviation 0.56 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)12 stations | |||||
| LESLessines | 28.3 | 78 | 14:31:53.23+5.52 s | 14:31:56.72+9.01 s | 3.49 |
| SKQSteenkerque | 44.5 | 91 | 14:31:54.77+7.06 s | 14:32:00.49+12.78 s | 5.72 |
| BRQBracquegnies | 52.4 | 112 | 14:31:56.12+8.41 s | – | – |
| RQRRonquières | 55.1 | 96 | 14:31:57.51+9.80 s | – | – |
| BDHNBois d'Haine | 56.5 | 106 | 14:31:57.56+9.85 s | – | – |
| SNFSeneffe | 61.2 | 105 | 14:31:57.46+9.75 s | 14:32:05.21+17.50 s | 7.75 |
| MRDMaredsous | 101.5 | 112 | 14:32:04.19+16.48 s | 14:32:18.34+30.63 s | 14.15 |
| DOUDourbes | 102.7 | 127 | 14:32:06.88+19.17 s | 14:32:17.88+30.17 s | 11.00 |
| GESGesves | 119.9 | 104 | 14:32:08.99+21.28 s | 14:32:24.19+36.48 s | 15.20 |
| CLAClavier | 133.9 | 101 | 14:32:10.77+23.06 s | 14:32:28.00+40.29 s | 17.23 |
| RCHRochefort | 138.1 | 113 | 14:32:11.17+23.46 s | 14:32:27.21+39.50 s | 16.04 |
| KLBKalborn | 199.0 | 107 | 14:32:19.31+31.60 s | – | – |