FLORENNES (BE)
Quarry blast8 December 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 10:46:452021-12-08
- UTC
- 09:46:452021-12-08
Main parameters
| Date and time | 2021-12-08 09:46:45 UTC 2021-12-08 10:46:45 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.249° N, 4.641° E Uncertainty ± 4.2 km |
| Event ID | ROB 14950 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-10 09:51:32 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
- 4
- Epicentral distance
- 10.8 – 43.2km
- Mean velocity, P wave
- 7.5km/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: 4 measurements, root-mean-square deviation 0.45 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)4 stations | |||||
| MRDMaredsous | 10.8 | 57 | 09:46:47.50+2.25 s | 09:46:49.06+3.81 s | 1.56 |
| DOUDourbes | 17.5 | 191 | 09:46:48.53+3.28 s | 09:46:51.01+5.76 s | 2.48 |
| GESGesves | 35.2 | 64 | 09:46:51.61+6.36 s | – | – |
| RCHRochefort | 43.2 | 104 | 09:46:51.43+6.18 s | 09:46:58.58+13.33 s | 7.15 |
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