MARCHE-EN-FAMENNE (BE)
Quarry blast22 February 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 11:58:592021-02-22
- UTC
- 10:58:592021-02-22
Main parameters
| Date and time | 2021-02-22 10:58:59 UTC 2021-02-22 11:58:59 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.188° N, 5.246° E Uncertainty ± 1.1 km |
| Event ID | ROB 12680 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-03-05 15:01:37 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
- 6
- Epicentral distance
- 4.0 – 62.5km
- Mean velocity, P wave
- 5.9km/s
- Mean velocity, S wave
- 3.5km/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: 6 measurements, root-mean-square deviation 0.29 s. S wave: 6 measurements, root-mean-square deviation 0.68 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)6 stations | |||||
| RCHRochefort | 4.0 | 200 | 10:59:00.67+0.82 s | 10:59:01.30+1.45 s | 0.63 |
| GESGesves | 24.6 | 333 | 10:59:03.96+4.11 s | 10:59:07.95+8.10 s | 3.99 |
| CLAClavier | 26.0 | 9 | 10:59:04.76+4.91 s | 10:59:08.33+8.48 s | 3.57 |
| MRDMaredsous | 36.3 | 291 | 10:59:06.81+6.96 s | 10:59:10.44+10.59 s | 3.63 |
| DOUDourbes | 47.7 | 258 | 10:59:08.39+8.54 s | 10:59:12.54+12.69 s | 4.15 |
| KLBKalborn | 62.5 | 99 | 10:59:10.75+10.90 s | 10:59:18.46+18.61 s | 7.71 |