TOURNAI (BE)
Quarry blast30 January 2023
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:59:462023-01-30
- UTC
- 11:59:462023-01-30
Main parameters
| Date and time | 2023-01-30 11:59:46 UTC 2023-01-30 12:59:46 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.681° N, 3.406° E Uncertainty ± 7.3 km |
| Event ID | ROB 18565 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-01-30 14:18:31 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
- 8
- Epicentral distance
- 31.0 – 123.6km
- Mean velocity, P wave
- 6.3km/s
- Mean velocity, S wave
- 3.6km/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: 6 measurements, root-mean-square deviation 0.89 s. S wave: 4 measurements, root-mean-square deviation 0.46 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)8 stations | |||||
| LESLessines | 31.0 | 84 | – | 11:59:56.66+10.23 s | – |
| SKQSteenkerque | 47.8 | 94 | 11:59:54.86+8.43 s | 12:00:00.60+14.17 s | 5.74 |
| BLRGBlaregnies | 50.3 | 136 | 11:59:55.77+9.34 s | 12:00:00.72+14.29 s | 4.95 |
| RQRRonquières | 58.5 | 98 | 11:59:56.50+10.07 s | – | – |
| UCCSUccle | 68.5 | 79 | 11:59:56.32+9.89 s | – | – |
| TGATangissart | 79.4 | 96 | 12:00:00.27+13.84 s | – | – |
| DOUDourbes | 106.8 | 127 | 12:00:05.18+18.75 s | 12:00:16.49+30.06 s | 11.31 |
| GESGesves | 123.6 | 105 | 12:00:08.69+22.26 s | – | – |