TOURNAI (BE)
Quarry blast22 June 2023
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:00:162023-06-22
- UTC
- 11:00:162023-06-22
Main parameters
| Date and time | 2023-06-22 11:00:16 UTC 2023-06-22 13:00:16 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.672° N, 3.492° E Uncertainty ± 3.1 km |
| Event ID | ROB 19710 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-06-22 23:33:04 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 – 196.7km
- Mean velocity, P wave
- 5.9km/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 0.16 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 | 93 | 11:00:23.50+7.38 s | 11:00:29.31+13.19 s | 5.81 |
| RQRRonquières | 52.3 | 98 | 11:00:25.16+9.04 s | 11:00:31.83+15.71 s | 6.67 |
| SNFSeneffe | 58.8 | 107 | 11:00:25.98+9.86 s | 11:00:33.85+17.73 s | 7.87 |
| TGATangissart | 73.2 | 95 | 11:00:28.40+12.28 s | – | – |
| DOUDourbes | 101.3 | 129 | 11:00:33.45+17.33 s | – | – |
| GESGesves | 117.5 | 105 | 11:00:36.20+20.08 s | – | – |
| CLAClavier | 131.3 | 102 | 11:00:38.71+22.59 s | – | – |
| KLBKalborn | 196.7 | 108 | 11:00:48.06+31.94 s | – | – |