TOURNAI (BE)
Quarry blast9 January 2023
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:00:152023-01-09
- UTC
- 12:00:152023-01-09
Main parameters
| Date and time | 2023-01-09 12:00:15 UTC 2023-01-09 13:00:15 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.650° N, 3.467° E Uncertainty ± 7.9 km |
| Event ID | ROB 18315 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2023-01-10 17:02:11 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
- 8
- Epicentral distance
- 27.4 – 197.6km
- Mean velocity, P wave
- 5.7km/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 0.24 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)8 stations | |||||
| LESLessines | 27.4 | 76 | 12:00:19.62+4.36 s | 12:00:24.10+8.84 s | 4.48 |
| SKQSteenkerque | 43.3 | 90 | 12:00:22.77+7.51 s | 12:00:27.91+12.65 s | 5.14 |
| RQRRonquières | 53.8 | 95 | 12:00:24.62+9.36 s | – | – |
| SNFSeneffe | 59.9 | 105 | 12:00:25.56+10.30 s | – | – |
| DOUDourbes | 101.2 | 127 | 12:00:33.22+17.96 s | – | – |
| GESGesves | 118.6 | 104 | 12:00:35.54+20.28 s | 12:00:51.03+35.77 s | 15.49 |
| CLAClavier | 132.6 | 100 | 12:00:37.76+22.50 s | 12:00:54.05+38.79 s | 16.29 |
| KLBKalborn | 197.6 | 107 | 12:00:47.33+32.07 s | – | – |