TOURNAI (BE)
Quarry blast8 December 2022
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 12:31:062022-12-08
- UTC
- 11:31:062022-12-08
Main parameters
| Date and time | 2022-12-08 11:31:06 UTC 2022-12-08 12:31:06 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.644° N, 3.402° E Uncertainty ± 6.4 km |
| Event ID | ROB 17990 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-14 16:16:30 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
- 6
- Epicentral distance
- 47.6 – 201.8km
- Mean velocity, P wave
- 5.6km/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 0.22 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)6 stations | |||||
| BLRGBlaregnies | 47.6 | 132 | 11:31:14.15+7.79 s | 11:31:20.96+14.60 s | 6.81 |
| SKQSteenkerque | 47.9 | 89 | 11:31:14.78+8.42 s | 11:31:20.75+14.39 s | 5.97 |
| BRQBracquegnies | 55.1 | 109 | 11:31:15.94+9.58 s | – | – |
| RQRRonquières | 58.4 | 94 | 11:31:16.15+9.79 s | – | – |
| MRDMaredsous | 104.2 | 111 | 11:31:24.50+18.14 s | – | – |
| KLBKalborn | 201.8 | 106 | 11:31:39.20+32.84 s | – | – |