TOURNAI (BE)
Quarry blast15 March 2023
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:00:012023-03-15
- UTC
- 12:00:012023-03-15
Main parameters
| Date and time | 2023-03-15 12:00:01 UTC 2023-03-15 13:00:01 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.659° N, 3.444° E Uncertainty ± 21.8 km |
| Event ID | ROB 19025 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-03-17 12:27:56 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
- 28.8 – 103.1km
- Mean velocity, P wave
- 5.8km/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: 5 measurements, root-mean-square deviation 0.71 s. S wave: 4 measurements, root-mean-square deviation 0.42 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)5 stations | |||||
| LESLessines | 28.8 | 78 | 12:00:07.48+5.64 s | 12:00:11.24+9.40 s | 3.76 |
| SKQSteenkerque | 45.0 | 91 | 12:00:09.34+7.50 s | 12:00:15.23+13.39 s | 5.89 |
| BRQBracquegnies | 52.8 | 112 | 12:00:10.41+8.57 s | – | – |
| SNFSeneffe | 61.7 | 105 | 12:00:11.85+10.01 s | 12:00:20.60+18.76 s | 8.75 |
| DOUDourbes | 103.1 | 127 | 12:00:20.77+18.93 s | 12:00:32.30+30.46 s | 11.53 |