FERNELMONT (BE)
Quarry blast22 September 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 14:16:392021-09-22
- UTC
- 12:16:392021-09-22
Main parameters
| Date and time | 2021-09-22 12:16:39 UTC 2021-09-22 14:16:39 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.520° N, 4.990° E Uncertainty ± 1.6 km |
| Event ID | ROB 14470 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-23 13:59:52 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
- 16.5 – 92.4km
- Mean velocity, P wave
- 6.1km/s
- Mean velocity, S wave
- 3.4km/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 0.27 s. S wave: 6 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 | |||||
| GESGesves | 16.5 | 155 | 12:16:42.54+3.05 s | 12:16:44.40+4.91 s | 1.86 |
| CLAClavier | 24.8 | 117 | 12:16:44.11+4.62 s | 12:16:47.66+8.17 s | 3.55 |
| MRDMaredsous | 29.0 | 213 | 12:16:44.48+4.99 s | 12:16:48.99+9.50 s | 4.51 |
| TGATangissart | 34.5 | 286 | 12:16:45.78+6.29 s | – | – |
| RCHRochefort | 44.0 | 157 | 12:16:47.33+7.84 s | 12:16:53.37+13.88 s | 6.04 |
| DOUDourbes | 55.1 | 211 | 12:16:48.49+9.00 s | 12:16:56.20+16.71 s | 7.71 |
| KLBKalborn | 92.4 | 120 | 12:16:55.42+15.93 s | 12:17:06.84+27.35 s | 11.42 |