TOURNAI (BE)
Quarry blast28 March 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 12:31:562023-03-28
- UTC
- 10:31:562023-03-28
Main parameters
| Date and time | 2023-03-28 10:31:56 UTC 2023-03-28 12:31:56 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.643° N, 3.424° E Uncertainty ± 6.3 km |
| Event ID | ROB 19225 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-04-06 18:53:52 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
- 7
- Epicentral distance
- 30.6 – 153.9km
- Mean velocity, P wave
- 6.1km/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: 5 measurements, root-mean-square deviation 1.83 s. S wave: 4 measurements, root-mean-square deviation 0.98 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)7 stations | |||||
| LESLessines | 30.6 | 75 | 10:32:01.73+5.17 s | 10:32:05.53+8.97 s | 3.80 |
| SKQSteenkerque | 46.4 | 89 | 10:32:03.46+6.90 s | 10:32:08.59+12.03 s | 5.13 |
| RQRRonquières | 56.8 | 94 | 10:32:10.08+13.52 s | – | – |
| MRDMaredsous | 102.7 | 111 | 10:32:12.93+16.37 s | 10:32:27.17+30.61 s | 14.24 |
| DOUDourbes | 103.2 | 126 | 10:32:13.41+16.85 s | 10:32:25.70+29.14 s | 12.29 |
| GESGesves | 121.4 | 103 | 10:32:15.91+19.35 s | 10:32:33.10+36.54 s | 17.19 |
| LCHLa Chartreuse | 153.9 | 89 | 10:32:23.20+26.64 s | – | – |