TOURNAI (BE)
Quarry blast10 February 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:21:522022-02-10
- UTC
- 11:21:522022-02-10
Main parameters
| Date and time | 2022-02-10 11:21:52 UTC 2022-02-10 12:21:52 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.630° N, 3.374° E Uncertainty ± 3.9 km |
| Event ID | ROB 15445 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-02-11 11:18:53 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
- 10
- Epicentral distance
- 34.3 – 203.3km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.5km/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 0.44 s. S wave: 4 measurements, root-mean-square deviation 0.26 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)10 stations | |||||
| LESLessines | 34.3 | 75 | 11:21:58.96+6.86 s | 11:22:02.96+10.86 s | 4.00 |
| SKQSteenkerque | 50.0 | 87 | 11:22:00.87+8.77 s | 11:22:06.82+14.72 s | 5.95 |
| RQRRonquières | 60.3 | 92 | 11:22:02.70+10.60 s | – | – |
| SNFSeneffe | 65.8 | 101 | 11:22:03.51+11.41 s | 11:22:11.65+19.55 s | 8.14 |
| TGATangissart | 81.3 | 92 | 11:22:05.30+13.20 s | – | – |
| DOUDourbes | 105.3 | 124 | 11:22:10.67+18.57 s | 11:22:23.35+31.25 s | 12.68 |
| MRDMaredsous | 105.5 | 110 | 11:22:10.24+18.14 s | – | – |
| GESGesves | 124.5 | 102 | 11:22:13.35+21.25 s | 11:22:29.24+37.14 s | 15.89 |
| CLAClavier | 138.7 | 99 | 11:22:15.70+23.60 s | 11:22:32.97+40.87 s | 17.27 |
| KLBKalborn | 203.3 | 106 | 11:22:23.85+31.75 s | 11:22:47.52+55.42 s | 23.67 |