FERNELMONT (BE)
Quarry blast8 November 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 14:23:342021-11-08
- UTC
- 13:23:342021-11-08
Main parameters
| Date and time | 2021-11-08 13:23:34 UTC 2021-11-08 14:23:34 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.520° N, 5.006° E Uncertainty ± 1.0 km |
| Event ID | ROB 14715 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-11-08 14:28:32 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
- 16.1 – 91.4km
- Mean velocity, P wave
- 5.6km/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: 8 measurements, root-mean-square deviation 0.23 s. S wave: 6 measurements, root-mean-square deviation 0.34 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 | 16.1 | 159 | 13:23:37.12+2.77 s | 13:23:38.80+4.45 s | 1.68 |
| CLAClavier | 23.8 | 118 | 13:23:38.99+4.64 s | 13:23:41.77+7.42 s | 2.78 |
| MRDMaredsous | 29.6 | 215 | 13:23:39.76+5.41 s | 13:23:43.78+9.43 s | 4.02 |
| TGATangissart | 35.6 | 286 | 13:23:40.76+6.41 s | 13:23:44.84+10.49 s | 4.08 |
| DOUDourbes | 55.6 | 212 | 13:23:44.27+9.92 s | – | – |
| RQRRonquières | 56.2 | 280 | 13:23:44.04+9.69 s | – | – |
| KLBKalborn | 91.4 | 120 | 13:23:51.07+16.72 s | 13:24:01.42+27.07 s | 10.35 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 70.8 | 67 | 13:23:47.21+12.86 s | 13:23:55.03+20.68 s | 7.82 |