TOURNAI (BE)
Quarry blast27 February 2023
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 13:00:192023-02-27
- UTC
- 12:00:192023-02-27
Main parameters
| Date and time | 2023-02-27 12:00:19 UTC 2023-02-27 13:00:19 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.608° N, 3.373° E Uncertainty ± 7.3 km |
| Event ID | ROB 18915 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-03-02 12:09:43 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
- 4
- Epicentral distance
- 35.2 – 104.0km
- Mean velocity, P wave
- 5.6km/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: 4 measurements, root-mean-square deviation 0.35 s. S wave: 4 measurements, root-mean-square deviation 0.36 s.
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)4 stations | |||||
| LESLessines | 35.2 | 71 | 12:00:25.61+6.44 s | 12:00:29.38+10.21 s | 3.77 |
| SKQSteenkerque | 50.2 | 85 | 12:00:27.66+8.49 s | 12:00:33.09+13.92 s | 5.43 |
| SNFSeneffe | 65.5 | 99 | 12:00:30.03+10.86 s | 12:00:37.69+18.52 s | 7.66 |
| DOUDourbes | 104.0 | 123 | 12:00:37.35+18.18 s | 12:00:49.72+30.55 s | 12.37 |