TOURNAI (BE)
Quarry blast8 December 2022
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:00:162022-12-08
- UTC
- 12:00:162022-12-08
Main parameters
| Date and time | 2022-12-08 12:00:16 UTC 2022-12-08 13:00:16 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.620° N, 3.461° E Uncertainty ± 5.4 km |
| Event ID | ROB 17995 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-14 16:16:54 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
- 7
- Epicentral distance
- 42.7 – 197.1km
- Mean velocity, P wave
- 5.7km/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 0.38 s. S wave: 4 measurements, root-mean-square deviation 0.25 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 | |||||
| BLRGBlaregnies | 42.7 | 133 | 12:00:24.10+7.82 s | 12:00:28.92+12.64 s | 4.82 |
| SKQSteenkerque | 43.9 | 86 | 12:00:23.68+7.40 s | 12:00:29.47+13.19 s | 5.79 |
| BRQBracquegnies | 50.3 | 108 | 12:00:24.76+8.48 s | – | – |
| DOUDourbes | 99.6 | 125 | 12:00:33.39+17.11 s | 12:00:45.74+29.46 s | 12.35 |
| GESGesves | 118.3 | 102 | 12:00:37.57+21.29 s | 12:00:50.69+34.41 s | 13.12 |
| RCHRochefort | 135.8 | 112 | 12:00:38.08+21.80 s | 12:00:56.76+40.48 s | 18.68 |
| KLBKalborn | 197.1 | 106 | 12:00:48.02+31.74 s | 12:01:11.83+55.55 s | 23.81 |