TOURNAI (BE)
Quarry blast27 February 2023
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:30:242023-02-27
- UTC
- 11:30:242023-02-27
Main parameters
| Date and time | 2023-02-27 11:30:24 UTC 2023-02-27 12:30:24 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.608° N, 3.528° E Uncertainty ± 7.0 km |
| Event ID | ROB 18910 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-03-02 12:08:58 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
- 25.0 – 113.4km
- Mean velocity, P wave
- 5.7km/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: 4 measurements, root-mean-square deviation 0.71 s. S wave: 4 measurements, root-mean-square deviation 0.44 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 | 25.0 | 63 | 11:30:29.74+5.10 s | 11:30:32.09+7.45 s | 2.35 |
| SKQSteenkerque | 39.3 | 83 | 11:30:30.40+5.76 s | 11:30:35.95+11.31 s | 5.55 |
| DOUDourbes | 95.0 | 127 | 11:30:41.48+16.84 s | 11:30:52.57+27.93 s | 11.09 |
| GESGesves | 113.4 | 102 | 11:30:43.87+19.23 s | 11:30:59.24+34.60 s | 15.37 |