TOURNAI (BE)
Quarry blast15 December 2022
- Magnitude
- 2.1ML
- Depth
- –
- Belgian time
- 13:00:072022-12-15
- UTC
- 12:00:072022-12-15
Main parameters
| Date and time | 2022-12-15 12:00:07 UTC 2022-12-15 13:00:07 Belgian time |
|---|---|
| Magnitude | ML 2.1 |
| Epicentral coordinates | 50.655° N, 3.432° E Uncertainty ± 4.0 km |
| Event ID | ROB 18050 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-16 11:30:36 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
- 11
- Epicentral distance
- 29.7 – 200.2km
- Mean velocity, P wave
- 5.9km/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: 8 measurements, root-mean-square deviation 0.37 s. S wave: 6 measurements, root-mean-square deviation 0.18 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)11 stations | |||||
| LESLessines | 29.7 | 78 | 12:00:13.87+5.96 s | 12:00:17.00+9.09 s | 3.13 |
| SKQSteenkerque | 45.8 | 91 | 12:00:15.78+7.87 s | 12:00:21.71+13.80 s | 5.93 |
| BLRGBlaregnies | 46.9 | 135 | 12:00:15.82+7.91 s | 12:00:21.64+13.73 s | 5.82 |
| RQRRonquières | 56.4 | 95 | 12:00:17.46+9.55 s | – | – |
| SNFSeneffe | 62.4 | 105 | 12:00:18.22+10.31 s | – | – |
| TGATangissart | 77.3 | 94 | 12:00:20.86+12.95 s | 12:00:30.73+22.82 s | 9.87 |
| MRDMaredsous | 102.6 | 112 | 12:00:25.45+17.54 s | 12:00:38.40+30.49 s | 12.95 |
| DOUDourbes | 103.5 | 127 | 12:00:26.04+18.13 s | 12:00:38.89+30.98 s | 12.85 |
| GESGesves | 121.1 | 104 | 12:00:28.38+20.47 s | 12:00:44.63+36.72 s | 16.25 |
| CLAClavier | 135.1 | 100 | 12:00:30.53+22.62 s | 12:00:47.61+39.70 s | 17.08 |
| KLBKalborn | 200.2 | 107 | 12:00:40.43+32.52 s | – | – |