TOURNAI (BE)
Quarry blast16 February 2023
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 12:59:322023-02-16
- UTC
- 11:59:322023-02-16
Main parameters
| Date and time | 2023-02-16 11:59:32 UTC 2023-02-16 12:59:32 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.636° N, 3.533° E Uncertainty ± 11.0 km |
| Event ID | ROB 18725 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-02-22 00:29:46 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
- 5
- Epicentral distance
- 38.7 – 127.7km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.5km/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 1.08 s. S wave: 4 measurements, root-mean-square deviation 1.24 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)5 stations | |||||
| SKQSteenkerque | 38.7 | 88 | 11:59:38.28+5.76 s | 11:59:44.56+12.04 s | 6.28 |
| MRDMaredsous | 95.2 | 112 | 11:59:50.43+17.91 s | 12:00:01.95+29.43 s | 11.52 |
| DOUDourbes | 96.6 | 128 | 11:59:48.08+15.56 s | 12:00:00.34+27.82 s | 12.26 |
| GESGesves | 113.7 | 104 | 11:59:52.62+20.10 s | 12:00:03.91+31.39 s | 11.29 |
| CLAClavier | 127.7 | 100 | 11:59:53.95+21.43 s | 12:00:11.15+38.63 s | 17.20 |