SILLY (BE)
Quarry blast24 February 2022
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:40:102022-02-24
- UTC
- 12:40:102022-02-24
Main parameters
| Date and time | 2022-02-24 12:40:10 UTC 2022-02-24 13:40:10 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.635° N, 3.910° E Uncertainty ± 13.0 km |
| Event ID | ROB 15535 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-02-28 09:59:18 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
- 8
- Epicentral distance
- 9.7 – 88.0km
- Mean velocity, P wave
- 7.4km/s
- Mean velocity, S wave
- 2.9km/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 0.90 s. S wave: 5 measurements, root-mean-square deviation 1.38 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)8 stations | |||||
| LESLessines | 9.7 | 331 | 12:40:12.91+2.20 s | – | – |
| SKQSteenkerque | 12.1 | 83 | 12:40:11.22+0.51 s | 12:40:17.26+6.55 s | 6.04 |
| BRQBracquegnies | 23.5 | 137 | 12:40:12.52+1.81 s | – | – |
| SNFSeneffe | 29.9 | 117 | 12:40:13.63+2.92 s | – | – |
| UCCBUccle | 36.5 | 60 | 12:40:15.19+4.48 s | 12:40:23.47+12.76 s | 8.28 |
| MRDMaredsous | 71.3 | 121 | 12:40:20.54+9.83 s | 12:40:37.28+26.57 s | 16.74 |
| DOUDourbes | 77.4 | 141 | 12:40:20.90+10.19 s | 12:40:36.92+26.21 s | 16.02 |
| GESGesves | 88.0 | 108 | 12:40:23.61+12.90 s | 12:40:40.60+29.89 s | 16.99 |