NAMUR (BE)
Quarry blast12 April 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 13:32:022021-04-12
- UTC
- 11:32:022021-04-12
Main parameters
| Date and time | 2021-04-12 11:32:02 UTC 2021-04-12 13:32:02 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.490° N, 4.973° E Uncertainty ± 0.8 km |
| Event ID | ROB 13100 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-04-12 22:38:58 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
- 11
- Epicentral distance
- 14.2 – 91.9km
- Mean velocity, P wave
- 6.1km/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: 11 measurements, root-mean-square deviation 0.33 s. S wave: 10 measurements, root-mean-square deviation 0.46 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)10 stations | |||||
| GESGesves | 14.2 | 145 | 11:32:04.59+2.34 s | 11:32:06.84+4.59 s | 2.25 |
| CLAClavier | 24.7 | 109 | 11:32:06.76+4.51 s | 11:32:10.09+7.84 s | 3.33 |
| MRDMaredsous | 25.5 | 215 | 11:32:06.95+4.70 s | 11:32:11.10+8.85 s | 4.15 |
| TGATangissart | 34.4 | 292 | 11:32:08.21+5.96 s | 11:32:12.64+10.39 s | 4.43 |
| RCHRochefort | 41.4 | 154 | 11:32:09.74+7.49 s | 11:32:14.37+12.12 s | 4.63 |
| DOUDourbes | 51.5 | 212 | 11:32:11.71+9.46 s | 11:32:17.80+15.55 s | 6.09 |
| UCCBUccle | 55.2 | 308 | 11:32:11.65+9.40 s | 11:32:19.13+16.88 s | 7.48 |
| SKQSteenkerque | 65.7 | 286 | 11:32:13.05+10.80 s | – | – |
| MEMHMembach | 74.7 | 79 | 11:32:15.18+12.93 s | 11:32:24.93+22.68 s | 9.75 |
| KLBKalborn | 91.9 | 118 | 11:32:18.41+16.16 s | 11:32:28.68+26.43 s | 10.27 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.4 | 65 | 11:32:14.81+12.56 s | 11:32:24.72+22.47 s | 9.91 |