TOURNAI (BE)
Quarry blast11 May 2022
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 13:00:472022-05-11
- UTC
- 11:00:472022-05-11
Main parameters
| Date and time | 2022-05-11 11:00:47 UTC 2022-05-11 13:00:47 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.630° N, 3.512° E Uncertainty ± 2.0 km |
| Event ID | ROB 16150 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-05-13 15:38:44 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
- 25.1 – 371.6km
- 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: 7 measurements, root-mean-square deviation 0.34 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)10 stations | |||||
| LESLessines | 25.1 | 69 | 11:00:51.90+4.81 s | 11:00:55.41+8.32 s | 3.51 |
| SKQSteenkerque | 40.3 | 87 | 11:00:53.92+6.83 s | 11:00:59.33+12.24 s | 5.41 |
| RQRRonquières | 50.6 | 93 | 11:00:55.15+8.06 s | – | – |
| BDHNBois d'Haine | 51.5 | 104 | 11:00:55.98+8.89 s | – | – |
| SNFSeneffe | 56.3 | 103 | 11:00:56.31+9.22 s | 11:01:04.01+16.92 s | 7.70 |
| DOUDourbes | 97.4 | 127 | 11:01:03.89+16.80 s | – | – |
| GESGesves | 115.0 | 103 | 11:01:06.27+19.18 s | – | – |
| CLAClavier | 129.1 | 100 | 11:01:09.58+22.49 s | – | – |
| RCHRochefort | 132.9 | 113 | 11:01:10.11+23.02 s | – | – |
| KLBKalborn | 194.0 | 107 | 11:01:18.29+31.20 s | – | – |
| British Geological Survey (United Kingdom)1 station | |||||
| ELSH | 176.9 | 290 | 11:01:16.00+28.91 s | – | – |
| Network STR1 station | |||||
| WLSWelschbruch | 371.6 | 130 | 11:01:40.35+53.26 s | – | – |