TOURNAI (BE)
Quarry blast21 June 2022
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:30:032022-06-21
- UTC
- 10:30:032022-06-21
Main parameters
| Date and time | 2022-06-21 10:30:03 UTC 2022-06-21 12:30:03 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.649° N, 3.486° E Uncertainty ± 3.2 km |
| Event ID | ROB 16435 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-06-23 10:44:29 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
- 12
- Epicentral distance
- 26.2 – 196.3km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.4km/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: 8 measurements, root-mean-square deviation 0.23 s. S wave: 6 measurements, root-mean-square deviation 0.51 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)12 stations | |||||
| LESLessines | 26.2 | 75 | 10:30:07.75+4.44 s | 10:30:11.53+8.22 s | 3.78 |
| SKQSteenkerque | 42.0 | 90 | 10:30:10.88+7.57 s | 10:30:16.55+13.24 s | 5.67 |
| BRQBracquegnies | 49.7 | 112 | 10:30:12.09+8.78 s | – | – |
| RQRRonquières | 52.5 | 95 | 10:30:12.22+8.91 s | – | – |
| SNFSeneffe | 58.6 | 105 | 10:30:13.10+9.79 s | 10:30:21.29+17.98 s | 8.19 |
| MRDMaredsous | 98.9 | 113 | 10:30:20.24+16.93 s | 10:30:32.41+29.10 s | 12.17 |
| DOUDourbes | 100.1 | 128 | 10:30:20.54+17.23 s | 10:30:32.17+28.86 s | 11.63 |
| GESGesves | 117.3 | 104 | 10:30:23.24+19.93 s | 10:30:38.64+35.33 s | 15.40 |
| CLAClavier | 131.3 | 101 | 10:30:24.69+21.38 s | 10:30:41.32+38.01 s | 16.63 |
| RCHRochefort | 135.4 | 113 | 10:30:26.96+23.65 s | 10:30:44.49+41.18 s | 17.53 |
| MRGMont Rigi | 184.0 | 94 | 10:30:33.60+30.29 s | 10:30:55.16+51.85 s | 21.56 |
| KLBKalborn | 196.3 | 107 | 10:30:35.15+31.84 s | 10:30:56.83+53.52 s | 21.68 |