BRUCK (DE)
Quarry blast28 October 2021
- Magnitude
- 1.7ML
- Depth
- –
- Belgian time
- 11:59:252021-10-28
- UTC
- 09:59:252021-10-28
Main parameters
| Date and time | 2021-10-28 09:59:25 UTC 2021-10-28 11:59:25 Belgian time |
|---|---|
| Magnitude | ML 1.7 |
| Epicentral coordinates | 50.272° N, 6.796° E Uncertainty ± 4.4 km |
| Event ID | ROB 14700 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-11-08 14:21:55 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
- 52.6 – 158.4km
- Mean velocity, P wave
- 5.3km/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: 4 measurements, root-mean-square deviation 0.15 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)5 stations | |||||
| KLBKalborn | 52.6 | 249 | 09:59:33.44+8.35 s | – | – |
| HOUHouvegnez | 57.1 | 280 | 09:59:34.51+9.42 s | – | – |
| RCHRochefort | 112.7 | 264 | 09:59:44.93+19.84 s | 10:00:00.29+35.20 s | 15.36 |
| GESGesves | 122.3 | 277 | 09:59:46.32+21.23 s | – | – |
| DOUDourbes | 158.4 | 264 | 09:59:51.37+26.28 s | 10:00:11.33+46.24 s | 19.96 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 82.2 | 312 | 09:59:39.45+14.36 s | – | – |