TOURNAI (BE)
Quarry blast1 December 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:082022-12-01
- UTC
- 12:00:082022-12-01
Main parameters
| Date and time | 2022-12-01 12:00:08 UTC 2022-12-01 13:00:08 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.737° N, 3.517° E Uncertainty ± 9.5 km |
| Event ID | ROB 17920 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-12-02 09:59:14 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
- 41.0 – 197.4km
- Mean velocity, P wave
- 5.2km/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 0.41 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 | |||||
| SKQSteenkerque | 41.0 | 104 | 12:00:16.02+7.05 s | 12:00:21.77+12.80 s | 5.75 |
| BRQBracquegnies | 52.3 | 123 | 12:00:17.44+8.47 s | – | – |
| SNFSeneffe | 59.8 | 115 | 12:00:18.46+9.49 s | 12:00:26.60+17.63 s | 8.14 |
| TGATangissart | 72.6 | 101 | 12:00:21.18+12.21 s | – | – |
| MRDMaredsous | 101.1 | 118 | 12:00:26.69+17.72 s | – | – |
| DOUDourbes | 104.7 | 133 | 12:00:28.04+19.07 s | 12:00:38.65+29.68 s | 10.61 |
| KLBKalborn | 197.4 | 110 | 12:00:40.49+31.52 s | 12:01:03.79+54.82 s | 23.30 |