LESSINES (BE)
Quarry blast6 April 2022
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:11:322022-04-06
- UTC
- 12:11:322022-04-06
Main parameters
| Date and time | 2022-04-06 12:11:32 UTC 2022-04-06 14:11:32 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.734° N, 3.860° E Uncertainty ± 1.9 km |
| Event ID | ROB 15880 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-09 11:58:22 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
- 9
- Epicentral distance
- 2.9 – 158.7km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.4km/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. Depth not determined: hypocenter placed at the surface for the calculation. P wave: 8 measurements, root-mean-square deviation 0.18 s. S wave: 4 measurements, root-mean-square deviation 0.50 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)9 stations | |||||
| LESLessines | 2.9 | 205 | 12:11:33.18+0.62 s | 12:11:33.49+0.93 s | 0.31 |
| SKQSteenkerque | 18.2 | 121 | 12:11:35.91+3.35 s | 12:11:38.23+5.67 s | 2.32 |
| RQRRonquières | 29.5 | 119 | 12:11:37.83+5.27 s | – | – |
| BRQBracquegnies | 34.3 | 145 | 12:11:38.90+6.34 s | – | – |
| SNFSeneffe | 39.0 | 129 | 12:11:39.68+7.12 s | – | – |
| TGATangissart | 49.0 | 107 | 12:11:41.22+8.66 s | 12:11:48.23+15.67 s | 7.01 |
| DOUDourbes | 88.2 | 143 | 12:11:47.63+15.07 s | – | – |
| GESGesves | 95.2 | 114 | 12:11:49.41+16.85 s | 12:12:00.64+28.08 s | 11.23 |
| MRGMont Rigi | 158.7 | 98 | 12:11:58.89+26.33 s | 12:12:17.93+45.37 s | 19.04 |