MARCHE-EN-FAMENNE (BE)
Quarry blast17 September 2021
- Magnitude
- 1.2ML
- Depth
- –
- Belgian time
- 12:16:302021-09-17
- UTC
- 10:16:302021-09-17
Main parameters
| Date and time | 2021-09-17 10:16:30 UTC 2021-09-17 12:16:30 Belgian time |
|---|---|
| Magnitude | ML 1.2 |
| Epicentral coordinates | 50.183° N, 5.252° E Uncertainty ± 0.5 km |
| Event ID | ROB 14445 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-18 12:21:48 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
- 8
- Epicentral distance
- 3.6 – 80.6km
- Mean velocity, P wave
- 5.8km/s
- Mean velocity, S wave
- 3.3km/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: 8 measurements, root-mean-square deviation 0.16 s. S wave: 7 measurements, root-mean-square deviation 0.32 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)7 stations | |||||
| RCHRochefort | 3.6 | 209 | 10:16:31.30+0.57 s | 10:16:32.19+1.46 s | 0.89 |
| GESGesves | 25.3 | 332 | 10:16:35.39+4.66 s | 10:16:38.66+7.93 s | 3.27 |
| CLAClavier | 26.5 | 8 | 10:16:35.32+4.59 s | 10:16:39.25+8.52 s | 3.93 |
| MRDMaredsous | 37.0 | 291 | 10:16:37.54+6.81 s | 10:16:42.02+11.29 s | 4.48 |
| DOUDourbes | 48.0 | 258 | 10:16:39.03+8.30 s | 10:16:45.22+14.49 s | 6.19 |
| KLBKalborn | 62.0 | 98 | 10:16:41.46+10.73 s | 10:16:49.28+18.55 s | 7.82 |
| MEMHMembach | 71.8 | 48 | 10:16:43.39+12.66 s | 10:16:53.26+22.53 s | 9.87 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 80.6 | 37 | 10:16:44.86+14.13 s | – | – |