TOURNAI (BE)
Quarry blast1 December 2022
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:31:342022-12-01
- UTC
- 11:31:342022-12-01
Main parameters
| Date and time | 2022-12-01 11:31:34 UTC 2022-12-01 12:31:34 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.655° N, 3.479° E Uncertainty ± 4.9 km |
| Event ID | ROB 17915 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-02 09:58:35 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
- 42.5 – 197.0km
- Mean velocity, P wave
- 5.8km/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: 6 measurements, root-mean-square deviation 0.20 s. S wave: 4 measurements, root-mean-square deviation 0.38 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 | |||||
| SKQSteenkerque | 42.5 | 91 | 11:31:42.51+7.61 s | 11:31:48.12+13.22 s | 5.61 |
| BRQBracquegnies | 50.4 | 112 | 11:31:43.73+8.83 s | – | – |
| RQRRonquières | 53.1 | 96 | 11:31:43.97+9.07 s | – | – |
| SNFSeneffe | 59.2 | 105 | 11:31:44.84+9.94 s | 11:31:52.48+17.58 s | 7.64 |
| DOUDourbes | 100.9 | 128 | 11:31:52.53+17.63 s | 11:32:04.54+29.64 s | 12.01 |
| GESGesves | 117.9 | 104 | 11:31:55.33+20.43 s | 11:32:10.41+35.51 s | 15.08 |
| CLAClavier | 131.9 | 101 | 11:31:57.09+22.19 s | – | – |
| LCHLa Chartreuse | 150.0 | 90 | 11:31:59.54+24.64 s | – | – |
| KLBKalborn | 197.0 | 107 | 11:32:06.32+31.42 s | 11:32:30.89+55.99 s | 24.57 |