TOURNAI (BE)
Quarry blast21 February 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:59:342023-02-21
- UTC
- 11:59:342023-02-21
Main parameters
| Date and time | 2023-02-21 11:59:34 UTC 2023-02-21 12:59:34 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.626° N, 3.480° E Uncertainty ± 1.6 km |
| Event ID | ROB 18835 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-02-25 15:34:16 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
- 6
- Epicentral distance
- 42.5 – 117.1km
- Mean velocity, P wave
- 5.9km/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 0.20 s. S wave: 5 measurements, root-mean-square deviation 0.43 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)6 stations | |||||
| SKQSteenkerque | 42.5 | 86 | 11:59:42.28+7.31 s | 11:59:48.28+13.31 s | 6.00 |
| BRQBracquegnies | 49.2 | 109 | 11:59:43.62+8.65 s | – | – |
| SNFSeneffe | 58.4 | 102 | 11:59:44.68+9.71 s | 11:59:51.88+16.91 s | 7.20 |
| TGATangissart | 73.8 | 91 | 11:59:47.35+12.38 s | 11:59:57.11+22.14 s | 9.76 |
| DOUDourbes | 98.9 | 126 | 11:59:52.07+17.10 s | 12:00:04.49+29.52 s | 12.42 |
| GESGesves | 117.1 | 103 | 11:59:54.81+19.84 s | 12:00:10.65+35.68 s | 15.84 |