BASTOGNE (BE)
Quarry blast20 April 2021
- Magnitude
- 1.4ML
- Depth
- –
- Belgian time
- 13:01:502021-04-20
- UTC
- 11:01:502021-04-20
Main parameters
| Date and time | 2021-04-20 11:01:50 UTC 2021-04-20 13:01:50 Belgian time |
|---|---|
| Magnitude | ML 1.4 |
| Epicentral coordinates | 50.040° N, 5.811° E Uncertainty ± 0.9 km |
| Event ID | ROB 13235 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-23 18:02:11 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
- 22.3 – 55.6km
- Mean velocity, P wave
- 5.7km/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 0.25 s. S wave: 4 measurements, root-mean-square deviation 0.37 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 | |||||
| KLBKalborn | 22.3 | 73 | 11:01:53.98+3.95 s | 11:01:57.55+7.52 s | 3.57 |
| VIAVianden | 30.4 | 113 | 11:01:55.43+5.40 s | 11:01:59.38+9.35 s | 3.95 |
| HOUHouvegnez | 37.5 | 22 | 11:01:57.03+7.00 s | 11:02:01.01+10.98 s | 3.98 |
| RCHRochefort | 43.7 | 287 | 11:01:57.67+7.64 s | 11:02:03.32+13.29 s | 5.65 |
| MRGMont Rigi | 55.6 | 20 | 11:02:00.35+10.32 s | – | – |