NAMUR (BE)
Quarry blast10 September 2021
- Magnitude
- 1.6ML
- Depth
- –
- Belgian time
- 14:49:592021-09-10
- UTC
- 12:49:592021-09-10
Main parameters
| Date and time | 2021-09-10 12:49:59 UTC 2021-09-10 14:49:59 Belgian time |
|---|---|
| Magnitude | ML 1.6 |
| Epicentral coordinates | 50.497° N, 4.965° E Uncertainty ± 2.1 km |
| Event ID | ROB 14400 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-09-13 08:42:09 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
- 15.2 – 92.7km
- 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: 11 measurements, root-mean-square deviation 0.36 s. S wave: 10 measurements, root-mean-square deviation 0.52 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 | 15.2 | 145 | 12:50:02.08+2.16 s | 12:50:04.33+4.41 s | 2.25 |
| CLAClavier | 25.5 | 110 | 12:50:04.32+4.40 s | 12:50:07.46+7.54 s | 3.14 |
| MRDMaredsous | 25.8 | 213 | 12:50:04.39+4.47 s | 12:50:08.98+9.06 s | 4.59 |
| TGATangissart | 33.6 | 291 | 12:50:05.68+5.76 s | 12:50:10.52+10.60 s | 4.84 |
| RCHRochefort | 42.4 | 154 | 12:50:07.01+7.09 s | 12:50:13.06+13.14 s | 6.05 |
| DOUDourbes | 51.9 | 211 | 12:50:09.26+9.34 s | 12:50:15.35+15.43 s | 6.09 |
| SKQSteenkerque | 64.9 | 285 | 12:50:10.48+10.56 s | 12:50:18.69+18.77 s | 8.21 |
| MEMHMembach | 75.1 | 80 | 12:50:13.07+13.15 s | 12:50:21.94+22.02 s | 8.87 |
| MEMSMembach | 75.1 | 80 | 12:50:13.07+13.15 s | 12:50:21.92+22.00 s | 8.85 |
| KLBKalborn | 92.7 | 118 | 12:50:16.02+16.10 s | – | – |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.6 | 66 | 12:50:12.27+12.35 s | 12:50:22.42+22.50 s | 10.15 |