TOURNAI (BE)
Quarry blast19 August 2022
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:01:362022-08-19
- UTC
- 10:01:362022-08-19
Main parameters
| Date and time | 2022-08-19 10:01:36 UTC 2022-08-19 12:01:36 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.654° N, 3.451° E Uncertainty ± 4.0 km |
| Event ID | ROB 16875 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-19 13:16:38 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
- 7
- Epicentral distance
- 44.5 – 198.9km
- Mean velocity, P wave
- 5.8km/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: 6 measurements, root-mean-square deviation 0.17 s. S wave: 5 measurements, root-mean-square deviation 0.56 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)7 stations | |||||
| SKQSteenkerque | 44.5 | 91 | 10:01:44.65+7.69 s | 10:01:50.88+13.92 s | 6.23 |
| RQRRonquières | 55.0 | 95 | 10:01:46.46+9.50 s | 10:01:53.42+16.46 s | 6.96 |
| SNFSeneffe | 61.1 | 105 | 10:01:47.09+10.13 s | 10:01:54.32+17.36 s | 7.23 |
| MRDMaredsous | 101.4 | 112 | 10:01:54.09+17.13 s | – | – |
| DOUDourbes | 102.5 | 127 | 10:01:54.62+17.66 s | 10:02:07.23+30.27 s | 12.61 |
| GESGesves | 119.8 | 104 | 10:01:57.37+20.41 s | 10:02:13.29+36.33 s | 15.92 |
| KLBKalborn | 198.9 | 107 | 10:02:09.07+32.11 s | 10:02:33.15+56.19 s | 24.08 |