TOURNAI (BE)
Quarry blast19 July 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:252022-07-19
- UTC
- 11:00:252022-07-19
Main parameters
| Date and time | 2022-07-19 11:00:25 UTC 2022-07-19 13:00:25 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.650° N, 3.454° E Uncertainty ± 3.9 km |
| Event ID | ROB 16640 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-07-22 10:50:29 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
- 13
- Epicentral distance
- 28.4 – 198.5km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.3km/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 0.27 s. S wave: 4 measurements, root-mean-square deviation 0.29 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 | 28.4 | 76 | 11:00:31.09+5.31 s | 11:00:34.62+8.84 s | 3.53 |
| SKQSteenkerque | 44.3 | 90 | 11:00:33.29+7.51 s | 11:00:39.15+13.37 s | 5.86 |
| BRQBracquegnies | 51.9 | 111 | 11:00:34.45+8.67 s | – | – |
| RQRRonquières | 54.8 | 95 | 11:00:35.01+9.23 s | – | – |
| SNFSeneffe | 60.8 | 104 | 11:00:35.67+9.89 s | – | – |
| TGATangissart | 75.8 | 93 | 11:00:38.03+12.25 s | – | – |
| DOUDourbes | 102.0 | 127 | 11:00:43.06+17.28 s | 11:00:56.34+30.56 s | 13.28 |
| GESGesves | 119.5 | 104 | 11:00:45.64+19.86 s | 11:01:02.40+36.62 s | 16.76 |
| CLAClavier | 133.5 | 100 | 11:00:49.13+23.35 s | 11:01:05.31+39.53 s | 16.18 |
| RCHRochefort | 137.6 | 113 | 11:00:49.12+23.34 s | 11:01:05.36+39.58 s | 16.24 |
| MEMHMembach | 180.9 | 90 | 11:00:56.67+30.89 s | 11:01:17.03+51.25 s | 20.36 |
| KLBKalborn | 198.5 | 107 | 11:00:57.75+31.97 s | 11:01:20.58+54.80 s | 22.83 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 175.5 | 85 | 11:00:55.06+29.28 s | – | – |