LESSINES (BE)
Quarry blast17 November 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 14:03:202021-11-17
- UTC
- 13:03:202021-11-17
Main parameters
| Date and time | 2021-11-17 13:03:20 UTC 2021-11-17 14:03:20 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.734° N, 3.866° E Uncertainty ± 4.6 km |
| Event ID | ROB 14790 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-11-18 10:49:39 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
- 7
- Epicentral distance
- 3.1 – 94.8km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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 0.17 s. S wave: 4 measurements, root-mean-square deviation 0.37 s.
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)7 stations | |||||
| LESLessines | 3.1 | 212 | 13:03:20.88+0.60 s | – | – |
| SKQSteenkerque | 17.9 | 122 | 13:03:23.62+3.34 s | 13:03:26.01+5.73 s | 2.39 |
| BRQBracquegnies | 34.1 | 146 | 13:03:26.47+6.19 s | – | – |
| SNFSeneffe | 38.6 | 130 | 13:03:27.06+6.78 s | 13:03:32.26+11.98 s | 5.20 |
| TGATangissart | 48.5 | 107 | 13:03:28.88+8.60 s | 13:03:34.94+14.66 s | 6.06 |
| DOUDourbes | 88.0 | 144 | 13:03:35.42+15.14 s | 13:03:45.40+25.12 s | 9.98 |
| GESGesves | 94.8 | 114 | 13:03:36.57+16.29 s | – | – |