SOIGNIES (BE)
Quarry blast30 September 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:10:222021-09-30
- UTC
- 12:10:222021-09-30
Main parameters
| Date and time | 2021-09-30 12:10:22 UTC 2021-09-30 14:10:22 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.588° N, 4.082° E Uncertainty ± 1.8 km |
| Event ID | ROB 14540 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-01 09:16:05 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
- 6.8 – 65.9km
- Mean velocity, P wave
- 5.6km/s
- Mean velocity, S wave
- 3.3km/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 0.34 s. S wave: 4 measurements, root-mean-square deviation 0.42 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 | |||||
| SKQSteenkerque | 6.8 | 359 | 12:10:23.85+1.12 s | 12:10:25.23+2.50 s | 1.38 |
| RQRRonquières | 10.3 | 79 | 12:10:24.50+1.77 s | 12:10:26.64+3.91 s | 2.14 |
| BRQBracquegnies | 12.5 | 162 | 12:10:25.06+2.33 s | – | – |
| SNFSeneffe | 16.7 | 121 | 12:10:25.58+2.85 s | 12:10:28.38+5.65 s | 2.80 |
| TGATangissart | 31.2 | 86 | 12:10:27.90+5.17 s | – | – |
| MRDMaredsous | 58.2 | 123 | 12:10:33.22+10.49 s | – | – |
| DOUDourbes | 65.9 | 146 | 12:10:35.07+12.34 s | 12:10:42.43+19.70 s | 7.36 |