TOURNAI (BE)
Quarry blast19 July 2022
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:31:182022-07-19
- UTC
- 10:31:182022-07-19
Main parameters
| Date and time | 2022-07-19 10:31:18 UTC 2022-07-19 12:31:18 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.646° N, 3.530° E Uncertainty ± 32.7 km |
| Event ID | ROB 16635 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-07-22 10:50:01 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
- 5
- Epicentral distance
- 23.3 – 97.5km
- Mean velocity, P wave
- 5.9km/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: 5 measurements, root-mean-square deviation 0.82 s. S wave: 4 measurements, root-mean-square deviation 0.56 s.
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)5 stations | |||||
| LESLessines | 23.3 | 72 | 10:31:22.66+4.18 s | 10:31:26.21+7.73 s | 3.55 |
| SKQSteenkerque | 38.9 | 89 | 10:31:24.86+6.38 s | 10:31:30.75+12.27 s | 5.89 |
| BDHNBois d'Haine | 50.8 | 107 | 10:31:28.38+9.90 s | – | – |
| SNFSeneffe | 55.5 | 105 | 10:31:27.22+8.74 s | 10:31:35.50+17.02 s | 8.28 |
| DOUDourbes | 97.5 | 129 | 10:31:36.37+17.89 s | 10:31:46.36+27.88 s | 9.99 |