NICKENICH (DE)
Quarry blast1 December 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 11:57:552021-12-01
- UTC
- 10:57:552021-12-01
Main parameters
| Date and time | 2021-12-01 10:57:55 UTC 2021-12-01 11:57:55 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.444° N, 7.330° E Uncertainty ± 3.7 km |
| Event ID | ROB 14905 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-12-06 13:51:32 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
- 7
- Epicentral distance
- 86.6 – 153.3km
- Mean velocity, P wave
- 6.0km/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: 6 measurements, root-mean-square deviation 0.59 s. S wave: 4 measurements, root-mean-square deviation 0.65 s.
Stations farther than 120 km are left out of the fit: the first waves to reach them have travelled beneath the crust, through the mantle, where they propagate faster.
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 | |||||
| TNLTernell | 86.6 | 281 | 10:58:09.85+14.71 s | 10:58:21.21+26.07 s | 11.36 |
| HOUHouvegnez | 94.8 | 264 | 10:58:12.16+17.02 s | 10:58:24.73+29.59 s | 12.57 |
| KLBKalborn | 95.1 | 247 | 10:58:10.29+15.15 s | – | – |
| MEMSMembach | 95.4 | 282 | 10:58:11.46+16.32 s | 10:58:23.30+28.16 s | 11.84 |
| VIAVianden | 98.5 | 235 | 10:58:12.08+16.94 s | – | – |
| RCHRochefort | 153.3 | 259 | 10:58:20.15+25.01 s | 10:58:40.51+45.37 s | 20.36 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 105.2 | 290 | 10:58:13.49+18.35 s | 10:58:26.24+31.10 s | 12.75 |