TOURNAI (BE)
Quarry blast2 August 2022
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:30:482022-08-02
- UTC
- 10:30:482022-08-02
Main parameters
| Date and time | 2022-08-02 10:30:48 UTC 2022-08-02 12:30:48 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.628° N, 3.493° E Uncertainty ± 9.0 km |
| Event ID | ROB 16725 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-08 11:31:29 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
- 8
- Epicentral distance
- 41.6 – 195.2km
- Mean velocity, P wave
- 5.4km/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: 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)8 stations | |||||
| SKQSteenkerque | 41.6 | 87 | 10:30:54.57+6.44 s | 10:31:00.78+12.65 s | 6.21 |
| RQRRonquières | 51.9 | 92 | 10:30:56.81+8.68 s | – | – |
| MRDMaredsous | 97.6 | 111 | 10:31:05.33+17.20 s | – | – |
| DOUDourbes | 98.4 | 127 | 10:31:04.44+16.31 s | 10:31:16.20+28.07 s | 11.76 |
| GESGesves | 116.3 | 103 | 10:31:08.66+20.53 s | – | – |
| CLAClavier | 130.4 | 100 | 10:31:10.36+22.23 s | – | – |
| RCHRochefort | 134.1 | 112 | 10:31:11.11+22.98 s | – | – |
| KLBKalborn | 195.2 | 107 | 10:31:18.99+30.86 s | – | – |