TOURNAI (BE)
Quarry blast11 April 2022
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:00:092022-04-11
- UTC
- 11:00:092022-04-11
Main parameters
| Date and time | 2022-04-11 11:00:09 UTC 2022-04-11 13:00:09 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.641° N, 3.430° E Uncertainty ± 20.6 km |
| Event ID | ROB 15925 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-13 08:21:08 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
- 30.2 – 120.9km
- Mean velocity, P wave
- 6.1km/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: 7 measurements, root-mean-square deviation 0.43 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 | 30.2 | 75 | 11:00:15.32+6.30 s | 11:00:18.39+9.37 s | 3.07 |
| SKQSteenkerque | 45.9 | 89 | 11:00:16.77+7.75 s | 11:00:22.77+13.75 s | 6.00 |
| BRQBracquegnies | 53.1 | 109 | 11:00:18.15+9.13 s | – | – |
| RQRRonquières | 56.4 | 94 | 11:00:18.91+9.89 s | – | – |
| SNFSeneffe | 62.2 | 103 | 11:00:19.36+10.34 s | – | – |
| TGATangissart | 77.3 | 93 | 11:00:22.01+12.99 s | – | – |
| DOUDourbes | 102.7 | 126 | 11:00:26.95+17.93 s | 11:00:39.38+30.36 s | 12.43 |
| GESGesves | 120.9 | 103 | 11:00:29.32+20.30 s | 11:00:46.97+37.95 s | 17.65 |