LA ROCHE-EN-ARDENNE (BE)
Quarry blast19 April 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 16:39:582021-04-19
- UTC
- 14:39:582021-04-19
Main parameters
| Date and time | 2021-04-19 14:39:58 UTC 2021-04-19 16:39:58 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.204° N, 5.594° E Uncertainty ± 2.1 km |
| Event ID | ROB 13185 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-19 19:17:29 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
- 10
- Epicentral distance
- 26.8 – 99.3km
- Mean velocity, P wave
- 5.2km/s
- Mean velocity, S wave
- 3.2km/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: 10 measurements, root-mean-square deviation 0.22 s. S wave: 7 measurements, root-mean-square deviation 0.19 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)9 stations | |||||
| RCHRochefort | 26.8 | 258 | 14:40:02.68+4.45 s | 14:40:05.96+7.73 s | 3.28 |
| CLAClavier | 31.7 | 319 | 14:40:03.78+5.55 s | 14:40:07.51+9.28 s | 3.73 |
| HOUHouvegnez | 33.7 | 60 | 14:40:03.87+5.64 s | 14:40:07.60+9.37 s | 3.73 |
| KLBKalborn | 38.6 | 107 | 14:40:04.93+6.70 s | 14:40:09.16+10.93 s | 4.23 |
| GESGesves | 41.4 | 299 | 14:40:05.52+7.29 s | – | – |
| MRGMont Rigi | 48.4 | 45 | 14:40:06.47+8.24 s | – | – |
| VIAVianden | 52.8 | 124 | 14:40:07.60+9.37 s | 14:40:13.92+15.69 s | 6.32 |
| MEMHMembach | 53.9 | 33 | 14:40:07.53+9.30 s | 14:40:14.12+15.89 s | 6.59 |
| SNFSeneffe | 99.3 | 291 | 14:40:16.77+18.54 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 66.8 | 21 | 14:40:09.85+11.62 s | 14:40:18.03+19.80 s | 8.18 |