LESSINES (BE)
Quarry blast27 April 2022
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:00:112022-04-27
- UTC
- 11:00:112022-04-27
Main parameters
| Date and time | 2022-04-27 11:00:11 UTC 2022-04-27 13:00:11 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.702° N, 3.899° E Uncertainty ± 6.4 km |
| Event ID | ROB 16025 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-04-27 17:11:39 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
- 6
- Epicentral distance
- 25.4 – 170.8km
- 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: 5 measurements, root-mean-square deviation 0.38 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)6 stations | |||||
| RQRRonquières | 25.4 | 115 | 11:00:16.71+4.82 s | – | – |
| SNFSeneffe | 34.6 | 128 | 11:00:17.92+6.03 s | 11:00:22.20+10.31 s | 4.28 |
| MRDMaredsous | 76.1 | 125 | 11:00:25.33+13.44 s | – | – |
| DOUDourbes | 83.7 | 143 | 11:00:25.66+13.77 s | 11:00:37.24+25.35 s | 11.58 |
| GESGesves | 91.3 | 112 | 11:00:27.98+16.09 s | 11:00:38.91+27.02 s | 10.93 |
| KLBKalborn | 170.8 | 112 | 11:00:40.04+28.15 s | – | – |