TOURNAI (BE)
Quarry blast2 August 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:00:082023-08-02
- UTC
- 11:00:082023-08-02
Main parameters
| Date and time | 2023-08-02 11:00:08 UTC 2023-08-02 13:00:08 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.661° N, 3.455° E Uncertainty ± 23.6 km |
| Event ID | ROB 19965 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-08-02 16:01:09 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
- 28.0 – 119.7km
- Mean velocity, P wave
- 5.9km/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 0.64 s. S wave: 5 measurements, root-mean-square deviation 0.55 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 | |||||
| LESLessines | 28.0 | 78 | 11:00:13.98+5.60 s | 11:00:17.58+9.20 s | 3.60 |
| SKQSteenkerque | 44.2 | 91 | 11:00:15.92+7.54 s | 11:00:21.68+13.30 s | 5.76 |
| RQRRonquières | 54.8 | 96 | 11:00:17.50+9.12 s | 11:00:24.23+15.85 s | 6.73 |
| SNFSeneffe | 61.0 | 106 | 11:00:18.34+9.96 s | – | – |
| DOUDourbes | 102.7 | 127 | 11:00:27.07+18.69 s | 11:00:38.41+30.03 s | 11.34 |
| GESGesves | 119.7 | 104 | 11:00:28.31+19.93 s | 11:00:44.62+36.24 s | 16.31 |