TOURNAI (BE)
Quarry blast13 July 2023
- Magnitude
- 2.0ML
- Depth
- –
- Belgian time
- 13:00:022023-07-13
- UTC
- 11:00:022023-07-13
Main parameters
| Date and time | 2023-07-13 11:00:02 UTC 2023-07-13 13:00:02 Belgian time |
|---|---|
| Magnitude | ML 2.0 |
| Epicentral coordinates | 50.623° N, 3.489° E Uncertainty ± 18.8 km |
| Event ID | ROB 19920 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-07-17 08:30:54 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
- 26.9 – 98.2km
- Mean velocity, P wave
- 6.1km/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 0.34 s. S wave: 5 measurements, root-mean-square deviation 0.25 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 | 26.9 | 68 | 11:00:07.27+5.21 s | 11:00:11.04+8.98 s | 3.77 |
| SKQSteenkerque | 41.9 | 86 | 11:00:09.30+7.24 s | – | – |
| BRQBracquegnies | 48.5 | 109 | 11:00:10.36+8.30 s | 11:00:16.71+14.65 s | 6.35 |
| RQRRonquières | 52.2 | 92 | 11:00:11.47+9.41 s | 11:00:17.94+15.88 s | 6.47 |
| SNFSeneffe | 57.7 | 102 | 11:00:11.71+9.65 s | 11:00:19.68+17.62 s | 7.97 |
| DOUDourbes | 98.2 | 126 | 11:00:19.25+17.19 s | 11:00:31.03+28.97 s | 11.78 |