FOISCHES (FR)
Quarry blast4 February 2021
- Magnitude
- 1.8ML
- Depth
- –
- Belgian time
- 10:59:262021-02-04
- UTC
- 09:59:262021-02-04
Main parameters
| Date and time | 2021-02-04 09:59:26 UTC 2021-02-04 10:59:26 Belgian time |
|---|---|
| Magnitude | ML 1.8 |
| Epicentral coordinates | 50.126° N, 4.783° E Uncertainty ± 0.7 km |
| Event ID | ROB 12125 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-02-04 11:45:07 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
- 13.9 – 49.3km
- Mean velocity, P wave
- 6.4km/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: 5 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 | 13.9 | 256 | 09:59:29.06+2.67 s | 09:59:31.31+4.92 s | 2.25 |
| MRDMaredsous | 19.6 | 357 | 09:59:29.97+3.58 s | 09:59:32.70+6.31 s | 2.73 |
| RCHRochefort | 31.9 | 84 | 09:59:31.82+5.43 s | 09:59:36.51+10.12 s | 4.69 |
| GESGesves | 36.1 | 37 | 09:59:33.04+6.65 s | 09:59:37.48+11.09 s | 4.44 |
| CLAClavier | 49.3 | 48 | 09:59:34.59+8.20 s | 09:59:41.68+15.29 s | 7.09 |