FERNELMONT (BE)
Quarry blast8 July 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:48:252021-07-08
- UTC
- 11:48:252021-07-08
Main parameters
| Date and time | 2021-07-08 11:48:25 UTC 2021-07-08 13:48:25 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.525° N, 4.972° E Uncertainty ± 1.0 km |
| Event ID | ROB 13920 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-07-09 11:05:45 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
- 26.2 – 93.8km
- Mean velocity, P wave
- 6.0km/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 0.28 s. S wave: 5 measurements, root-mean-square deviation 0.25 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 | |||||
| CLAClavier | 26.2 | 117 | 11:48:30.39+4.50 s | 11:48:34.32+8.43 s | 3.93 |
| MRDMaredsous | 28.7 | 210 | 11:48:31.04+5.15 s | 11:48:34.86+8.97 s | 3.82 |
| RCHRochefort | 45.0 | 156 | 11:48:33.71+7.82 s | 11:48:39.82+13.93 s | 6.11 |
| SNFSeneffe | 48.8 | 268 | 11:48:34.53+8.64 s | – | – |
| DOUDourbes | 54.8 | 209 | 11:48:35.68+9.79 s | 11:48:42.13+16.24 s | 6.45 |
| HOUHouvegnez | 75.8 | 104 | 11:48:38.70+12.81 s | – | – |
| KLBKalborn | 93.8 | 120 | 11:48:42.39+16.50 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 72.9 | 68 | 11:48:37.97+12.08 s | 11:48:48.00+22.11 s | 10.03 |