TOURNAI (BE)
Quarry blast4 April 2022
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:31:342022-04-04
- UTC
- 10:31:342022-04-04
Main parameters
| Date and time | 2022-04-04 10:31:34 UTC 2022-04-04 12:31:34 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.604° N, 3.501° E Uncertainty ± 4.6 km |
| Event ID | ROB 15890 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-09 12:01:51 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
- 12
- Epicentral distance
- 26.9 – 193.9km
- Mean velocity, P wave
- 6.0km/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: 9 measurements, root-mean-square deviation 0.42 s. S wave: 5 measurements, root-mean-square deviation 0.15 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)12 stations | |||||
| LESLessines | 26.9 | 64 | 10:31:39.02+4.83 s | 10:31:42.44+8.25 s | 3.42 |
| SKQSteenkerque | 41.2 | 83 | 10:31:41.05+6.86 s | 10:31:46.23+12.04 s | 5.18 |
| BRQBracquegnies | 47.0 | 107 | 10:31:42.34+8.15 s | – | – |
| RQRRonquières | 51.2 | 89 | 10:31:43.26+9.07 s | – | – |
| TGATangissart | 72.3 | 89 | 10:31:45.70+11.51 s | – | – |
| OSTBOostende | 80.9 | 331 | 10:31:48.81+14.62 s | – | – |
| MRDMaredsous | 96.0 | 110 | 10:31:50.33+16.14 s | 10:32:02.12+27.93 s | 11.79 |
| DOUDourbes | 96.2 | 126 | 10:31:50.43+16.24 s | 10:32:02.06+27.87 s | 11.63 |
| GESGesves | 115.1 | 102 | 10:31:53.40+19.21 s | 10:32:07.81+33.62 s | 14.41 |
| CLAClavier | 129.4 | 98 | 10:31:56.42+22.23 s | 10:32:12.03+37.84 s | 15.61 |
| RCHRochefort | 132.5 | 111 | 10:31:56.47+22.28 s | – | – |
| KLBKalborn | 193.9 | 106 | 10:32:05.13+30.94 s | – | – |