TOURNAI (BE)
Quarry blast31 May 2023
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:00:352023-05-31
- UTC
- 11:00:352023-05-31
Main parameters
| Date and time | 2023-05-31 11:00:35 UTC 2023-05-31 13:00:35 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.672° N, 3.594° E Uncertainty ± 12.1 km |
| Event ID | ROB 19570 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-05-31 17:20:45 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
- 34.4 – 189.8km
- Mean velocity, P wave
- 6.0km/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 0.70 s. S wave: 4 measurements, root-mean-square deviation 0.75 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 | 34.4 | 94 | 11:00:41.59+5.96 s | 11:00:47.27+11.64 s | 5.68 |
| BRQBracquegnies | 43.9 | 119 | 11:00:42.83+7.20 s | – | – |
| RQRRonquières | 45.2 | 99 | 11:00:43.18+7.55 s | 11:00:50.11+14.48 s | 6.93 |
| SNFSeneffe | 52.0 | 110 | 11:00:44.23+8.60 s | 11:00:51.60+15.97 s | 7.37 |
| TGATangissart | 66.0 | 96 | 11:00:46.40+10.77 s | – | – |
| DOUDourbes | 95.8 | 132 | 11:00:53.28+17.65 s | 11:01:03.44+27.81 s | 10.16 |
| KLBKalborn | 189.8 | 109 | 11:01:06.15+30.52 s | – | – |