TOURNAI (BE)
Quarry blast26 July 2022
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:00:132022-07-26
- UTC
- 11:00:132022-07-26
Main parameters
| Date and time | 2022-07-26 11:00:13 UTC 2022-07-26 13:00:13 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.625° N, 3.478° E Uncertainty ± 10.0 km |
| Event ID | ROB 16680 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-08-08 11:09:47 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
- 10
- Epicentral distance
- 27.6 – 196.1km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.2km/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 2.40 s. S wave: 4 measurements, root-mean-square deviation 1.23 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)10 stations | |||||
| LESLessines | 27.6 | 69 | 11:00:18.63+5.28 s | 11:00:21.75+8.40 s | 3.12 |
| SKQSteenkerque | 42.7 | 86 | 11:00:20.48+7.13 s | 11:00:24.45+11.10 s | 3.97 |
| BRQBracquegnies | 49.3 | 109 | 11:00:18.15+4.80 s | – | – |
| RQRRonquières | 52.9 | 92 | 11:00:21.57+8.22 s | – | – |
| SNFSeneffe | 58.5 | 102 | 11:00:22.98+9.63 s | 11:00:32.87+19.52 s | 9.89 |
| UCCBUccle | 65.2 | 73 | 11:00:30.11+16.76 s | – | – |
| DOUDourbes | 99.0 | 126 | 11:00:30.25+16.90 s | 11:00:43.92+30.57 s | 13.67 |
| GESGesves | 117.3 | 103 | 11:00:32.90+19.55 s | – | – |
| CLAClavier | 131.4 | 99 | 11:00:36.33+22.98 s | 11:00:53.70+40.35 s | 17.37 |
| KLBKalborn | 196.1 | 106 | 11:00:44.70+31.35 s | – | – |