LESSINES (BE)
Quarry blast10 March 2022
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 18:49:372022-03-10
- UTC
- 17:49:372022-03-10
Main parameters
| Date and time | 2022-03-10 17:49:37 UTC 2022-03-10 18:49:37 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.723° N, 3.845° E Uncertainty ± 11.4 km |
| Event ID | ROB 15645 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-03-16 09:42:20 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
- 10
- Epicentral distance
- 1.3 – 153.6km
- Mean velocity, P wave
- 5.2km/s
- Mean velocity, S wave
- 3.1km/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 0.65 s. S wave: 4 measurements, root-mean-square deviation 0.21 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 | 1.3 | 185 | 17:49:37.46−0.36 s | 17:49:37.82+0.00 s | 0.36 |
| SKQSteenkerque | 18.5 | 116 | 17:49:40.20+2.38 s | 17:49:42.74+4.92 s | 2.54 |
| BRQBracquegnies | 33.9 | 142 | 17:49:43.21+5.39 s | – | – |
| MRDMaredsous | 80.5 | 125 | 17:49:53.44+15.62 s | 17:50:02.59+24.77 s | 9.15 |
| DOUDourbes | 87.9 | 142 | 17:49:54.87+17.05 s | – | – |
| GESGesves | 95.7 | 113 | 17:49:55.62+17.80 s | 17:50:07.63+29.81 s | 12.01 |
| RCHRochefort | 116.7 | 122 | 17:49:58.51+20.69 s | – | – |
| MEMHMembach | 153.6 | 94 | 17:50:03.59+25.77 s | 17:50:20.86+43.04 s | 17.27 |
| MEMSMembach | 153.6 | 94 | 17:50:20.04+42.22 s | 17:50:22.04+44.22 s | 2.00 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 147.4 | 87 | 17:50:02.41+24.59 s | 17:50:19.32+41.50 s | 16.91 |