TOURNAI (BE)
Quarry blast23 August 2022
- Magnitude
- 2.3ML
- Depth
- –
- Belgian time
- 13:00:212022-08-23
- UTC
- 11:00:212022-08-23
Main parameters
| Date and time | 2022-08-23 11:00:21 UTC 2022-08-23 13:00:21 Belgian time |
|---|---|
| Magnitude | ML 2.3 |
| Epicentral coordinates | 50.655° N, 3.415° E Uncertainty ± 31.9 km |
| Event ID | ROB 16940 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-26 15:02:38 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
- 47.0 – 122.3km
- Mean velocity, P wave
- 5.9km/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: 6 measurements, root-mean-square deviation 0.26 s. S wave: 4 measurements, root-mean-square deviation 0.49 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 | 47.0 | 91 | 11:00:30.12+8.27 s | 11:00:36.25+14.40 s | 6.13 |
| BRQBracquegnies | 54.6 | 110 | 11:00:31.20+9.35 s | – | – |
| RQRRonquières | 57.6 | 95 | 11:00:32.26+10.41 s | 11:00:39.72+17.87 s | 7.46 |
| SNFSeneffe | 63.6 | 104 | 11:00:32.46+10.61 s | 11:00:40.15+18.30 s | 7.69 |
| MRDMaredsous | 103.7 | 112 | 11:00:39.82+17.97 s | – | – |
| DOUDourbes | 104.5 | 126 | 11:00:39.91+18.06 s | 11:00:52.81+30.96 s | 12.90 |
| GESGesves | 122.3 | 104 | 11:00:41.58+19.73 s | – | – |