TOURNAI (BE)
Quarry blast17 January 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:19:492023-01-17
- UTC
- 12:19:492023-01-17
Main parameters
| Date and time | 2023-01-17 12:19:49 UTC 2023-01-17 13:19:49 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.651° N, 3.414° E Uncertainty ± 6.1 km |
| Event ID | ROB 18415 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-01-18 10:26:30 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
- 31.0 – 201.2km
- Mean velocity, P wave
- 6.0km/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 0.25 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 | 31.0 | 78 | 12:19:55.27+5.98 s | 12:19:59.04+9.75 s | 3.77 |
| SKQSteenkerque | 47.1 | 90 | 12:19:57.39+8.10 s | 12:20:03.16+13.87 s | 5.77 |
| BRQBracquegnies | 54.5 | 110 | 12:19:58.56+9.27 s | – | – |
| DOUDourbes | 104.3 | 126 | 12:20:07.22+17.93 s | 12:20:20.17+30.88 s | 12.95 |
| GESGesves | 122.3 | 103 | 12:20:10.55+21.26 s | 12:20:25.88+36.59 s | 15.33 |
| CLAClavier | 136.3 | 100 | 12:20:11.62+22.33 s | 12:20:29.43+40.14 s | 17.81 |
| KLBKalborn | 201.2 | 107 | 12:20:21.92+32.63 s | 12:20:42.43+53.14 s | 20.51 |