TOURNAI (BE)
Quarry blast13 April 2022
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 12:29:462022-04-13
- UTC
- 10:29:462022-04-13
Main parameters
| Date and time | 2022-04-13 10:29:46 UTC 2022-04-13 12:29:46 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.620° N, 3.462° E Uncertainty ± 32.7 km |
| Event ID | ROB 15950 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-14 09:28:13 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
- 6
- Epicentral distance
- 43.8 – 132.4km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.3km/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 0.51 s. S wave: 4 measurements, root-mean-square deviation 0.55 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)6 stations | |||||
| SKQSteenkerque | 43.8 | 86 | 10:29:54.16+7.21 s | 10:30:00.25+13.30 s | 6.09 |
| RQRRonquières | 54.0 | 91 | 10:29:56.96+10.01 s | – | – |
| SNFSeneffe | 59.5 | 101 | 10:29:56.53+9.58 s | 10:30:04.76+17.81 s | 8.23 |
| DOUDourbes | 99.6 | 126 | 10:30:04.22+17.27 s | 10:30:16.25+29.30 s | 12.03 |
| GESGesves | 118.2 | 102 | 10:30:06.65+19.70 s | 10:30:23.44+36.49 s | 16.79 |
| CLAClavier | 132.4 | 99 | 10:30:09.34+22.39 s | 10:30:26.40+39.45 s | 17.06 |