LESSINES (BE)
Quarry blast27 April 2022
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 12:30:342022-04-27
- UTC
- 10:30:342022-04-27
Main parameters
| Date and time | 2022-04-27 10:30:34 UTC 2022-04-27 12:30:34 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.739° N, 3.845° E Uncertainty ± 9.4 km |
| Event ID | ROB 16020 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-27 17:11:10 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
- 3.1 – 175.9km
- Mean velocity, P wave
- 7.0km/s
- Mean velocity, S wave
- 3.6km/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 1.06 s. S wave: 5 measurements, root-mean-square deviation 1.41 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 | 3.1 | 182 | 10:30:36.90+2.08 s | 10:30:40.88+6.06 s | 3.98 |
| SKQSteenkerque | 19.4 | 121 | 10:30:39.02+4.20 s | 10:30:43.47+8.65 s | 4.45 |
| BRQBracquegnies | 35.4 | 144 | 10:30:40.19+5.37 s | – | – |
| SNFSeneffe | 40.1 | 129 | 10:30:41.39+6.57 s | 10:30:48.14+13.32 s | 6.75 |
| MRDMaredsous | 81.6 | 126 | 10:30:48.28+13.46 s | 10:30:59.90+25.08 s | 11.62 |
| DOUDourbes | 89.3 | 143 | 10:30:49.72+14.90 s | 10:31:01.05+26.23 s | 11.33 |
| GESGesves | 96.4 | 114 | 10:30:51.22+16.40 s | – | – |
| CLAClavier | 109.2 | 108 | 10:30:53.94+19.12 s | – | – |
| KLBKalborn | 175.9 | 113 | 10:31:03.39+28.57 s | – | – |