FOISCHES (FR)
Quarry blast19 October 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 11:45:112021-10-19
- UTC
- 09:45:112021-10-19
Main parameters
| Date and time | 2021-10-19 09:45:11 UTC 2021-10-19 11:45:11 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.118° N, 4.806° E Uncertainty ± 0.6 km |
| Event ID | ROB 14630 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-10-19 15:17:30 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
- 5
- Epicentral distance
- 15.3 – 48.7km
- Mean velocity, P wave
- 5.7km/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: 5 measurements, root-mean-square deviation 0.21 s. S wave: 4 measurements, root-mean-square deviation 0.14 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)5 stations | |||||
| DOUDourbes | 15.3 | 261 | 09:45:14.25+2.92 s | 09:45:16.51+5.18 s | 2.26 |
| MRDMaredsous | 20.7 | 353 | 09:45:15.26+3.93 s | 09:45:17.91+6.58 s | 2.65 |
| RCHRochefort | 30.4 | 82 | 09:45:16.83+5.50 s | 09:45:20.76+9.43 s | 3.93 |
| GESGesves | 35.9 | 34 | 09:45:18.39+7.06 s | 09:45:22.27+10.94 s | 3.88 |
| CLAClavier | 48.7 | 46 | 09:45:20.26+8.93 s | – | – |