FOISCHES (FR)
Quarry blast17 February 2021
- Magnitude
- 1.3ML
- Depth
- –
- Belgian time
- 11:56:302021-02-17
- UTC
- 10:56:302021-02-17
Main parameters
| Date and time | 2021-02-17 10:56:30 UTC 2021-02-17 11:56:30 Belgian time |
|---|---|
| Magnitude | ML 1.3 |
| Epicentral coordinates | 50.105° N, 4.790° E Uncertainty ± 0.8 km |
| Event ID | ROB 12475 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-24 23:09:44 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
- 14.0 – 50.6km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.2km/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 0.36 s. S wave: 5 measurements, root-mean-square deviation 0.23 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 | 14.0 | 266 | 10:56:33.52+2.60 s | 10:56:35.80+4.88 s | 2.28 |
| MRDMaredsous | 22.0 | 356 | 10:56:34.03+3.11 s | 10:56:37.84+6.92 s | 3.81 |
| RCHRochefort | 31.8 | 80 | 10:56:36.59+5.67 s | 10:56:40.86+9.94 s | 4.27 |
| GESGesves | 37.7 | 34 | 10:56:37.56+6.64 s | 10:56:42.47+11.55 s | 4.91 |
| CLAClavier | 50.6 | 46 | 10:56:39.83+8.91 s | 10:56:46.69+15.77 s | 6.86 |