TOURNAI (BE)
Quarry blast18 July 2022
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:30:382022-07-18
- UTC
- 10:30:382022-07-18
Main parameters
| Date and time | 2022-07-18 10:30:38 UTC 2022-07-18 12:30:38 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.662° N, 3.433° E Uncertainty ± 2.8 km |
| Event ID | ROB 16625 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-07-21 23:45:31 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
- 13
- Epicentral distance
- 29.5 – 200.3km
- Mean velocity, P wave
- 6.2km/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 0.33 s. S wave: 5 measurements, root-mean-square deviation 0.38 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)13 stations | |||||
| LESLessines | 29.5 | 79 | 10:30:44.54+6.04 s | 10:30:48.08+9.58 s | 3.54 |
| SKQSteenkerque | 45.8 | 92 | 10:30:46.61+8.11 s | 10:30:52.79+14.29 s | 6.18 |
| BRQBracquegnies | 53.7 | 112 | 10:30:47.75+9.25 s | – | – |
| RQRRonquières | 56.4 | 96 | 10:30:48.49+9.99 s | – | – |
| SNFSeneffe | 62.5 | 105 | 10:30:48.95+10.45 s | 10:30:57.11+18.61 s | 8.16 |
| TGATangissart | 77.3 | 94 | 10:30:51.49+12.99 s | 10:31:01.11+22.61 s | 9.62 |
| MRDMaredsous | 102.8 | 112 | 10:30:55.91+17.41 s | – | – |
| DOUDourbes | 103.9 | 127 | 10:30:56.64+18.14 s | 10:31:09.85+31.35 s | 13.21 |
| GESGesves | 121.2 | 104 | 10:30:59.03+20.53 s | 10:31:14.33+35.83 s | 15.30 |
| CLAClavier | 135.2 | 101 | 10:31:01.53+23.03 s | 10:31:17.97+39.47 s | 16.44 |
| RCHRochefort | 139.4 | 113 | 10:31:02.04+23.54 s | 10:31:19.44+40.94 s | 17.40 |
| MRGMont Rigi | 187.8 | 94 | 10:31:08.65+30.15 s | – | – |
| KLBKalborn | 200.3 | 107 | 10:31:10.94+32.44 s | 10:31:33.11+54.61 s | 22.17 |