BIERGHES (BE)
Quarry blast17 October 2022
- Magnitude
- 0.8ML
- Depth
- –
- Belgian time
- 13:09:532022-10-17
- UTC
- 11:09:532022-10-17
Main parameters
| Date and time | 2022-10-17 11:09:53 UTC 2022-10-17 13:09:53 Belgian time |
|---|---|
| Magnitude | ML 0.8 |
| Epicentral coordinates | 50.686° N, 4.120° E Uncertainty ± 1.6 km |
| Event ID | ROB 17395 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2022-10-18 11:13:27 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
- 5.0 – 29.8km
- Mean velocity, P wave
- 5.7km/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: 6 measurements, root-mean-square deviation 0.11 s. S wave: 4 measurements, root-mean-square deviation 0.30 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 | nm | |
|---|---|---|---|---|---|---|
| Belgian seismic network (Royal Observatory of Belgium)6 stations | ||||||
| SKQSteenkerque | 5.0 | 214 | 11:09:54.72+1.04 s | 11:09:55.20+1.52 s | 0.48 | 22.4 |
| RQRRonquières | 11.6 | 140 | 11:09:55.95+2.27 s | – | – | – |
| UCCBUccle | 21.0 | 54 | 11:09:57.73+4.05 s | 11:10:00.19+6.51 s | 2.46 | – |
| SNFSeneffe | 22.7 | 149 | 11:09:57.98+4.30 s | 11:10:00.85+7.17 s | 2.87 | 4.5 |
| BRQBracquegnies | 22.9 | 177 | 11:09:58.02+4.34 s | – | – | – |
| TGATangissart | 29.8 | 107 | 11:09:58.96+5.28 s | 11:10:02.16+8.48 s | 3.20 | – |