TOURNAI (BE)
Quarry blast20 June 2023
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 12:31:112023-06-20
- UTC
- 10:31:112023-06-20
Main parameters
| Date and time | 2023-06-20 10:31:11 UTC 2023-06-20 12:31:11 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.651° N, 3.559° E Uncertainty ± 16.4 km |
| Event ID | ROB 19665 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-06-21 23:53:47 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
- 7
- Epicentral distance
- 21.1 – 126.2km
- Mean velocity, P wave
- 5.5km/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 0.68 s. S wave: 6 measurements, root-mean-square deviation 0.68 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 | |||||
| LESLessines | 21.1 | 71 | 10:31:15.08+3.82 s | 10:31:18.46+7.20 s | 3.38 |
| SKQSteenkerque | 36.8 | 90 | 10:31:17.25+5.99 s | 10:31:22.63+11.37 s | 5.38 |
| BRQBracquegnies | 45.0 | 115 | 10:31:18.30+7.04 s | 10:31:24.83+13.57 s | 6.53 |
| RQRRonquières | 47.4 | 96 | 10:31:18.85+7.59 s | 10:31:25.44+14.18 s | 6.59 |
| MRDMaredsous | 94.2 | 114 | 10:31:29.03+17.77 s | 10:31:40.01+28.75 s | 10.98 |
| DOUDourbes | 96.2 | 130 | 10:31:28.87+17.61 s | 10:31:38.93+27.67 s | 10.06 |
| CLAClavier | 126.2 | 101 | 10:31:33.09+21.83 s | 10:31:48.50+37.24 s | 15.41 |