TOURNAI (BE)
Quarry blast20 May 2022
- Magnitude
- 1.9ML
- Depth
- 10.1km ± 2.3
- Belgian time
- 13:00:422022-05-20
- UTC
- 11:00:422022-05-20
Main parameters
| Date and time | 2022-05-20 11:00:42 UTC 2022-05-20 13:00:42 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.626° N, 3.395° E Uncertainty ± 3.8 km |
| Depth of hypocenter | 10.1 ± 2.3 km |
| Event ID | ROB 16220 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-05-20 16:04:48 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
- 33.0 – 140.4km
- Mean velocity, P wave
- 6.4km/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. Hypocenter at a depth of 10.1 km. P wave: 5 measurements, root-mean-square deviation 0.14 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 | 33.0 | 73 | 11:00:48.77+6.27 s | 11:00:52.30+9.80 s | 3.53 |
| SKQSteenkerque | 48.5 | 87 | 11:00:50.97+8.47 s | 11:00:56.79+14.29 s | 5.82 |
| RQRRonquières | 58.8 | 92 | 11:00:52.58+10.08 s | – | – |
| SNFSeneffe | 64.3 | 101 | 11:00:53.13+10.63 s | 11:01:01.96+19.46 s | 8.83 |
| DOUDourbes | 103.8 | 124 | 11:00:59.61+17.11 s | – | – |
| GESGesves | 123.0 | 102 | 11:01:02.98+20.48 s | 11:01:18.14+35.64 s | 15.16 |
| CLAClavier | 137.2 | 99 | 11:01:05.46+22.96 s | 11:01:22.72+40.22 s | 17.26 |
| RCHRochefort | 140.4 | 111 | 11:01:04.61+22.11 s | 11:01:22.05+39.55 s | 17.44 |