NAMUR (BE)
Quarry blast7 June 2021
- Magnitude
- 1.9ML
- Depth
- –
- Belgian time
- 13:45:092021-06-07
- UTC
- 11:45:092021-06-07
Main parameters
| Date and time | 2021-06-07 11:45:09 UTC 2021-06-07 13:45:09 Belgian time |
|---|---|
| Magnitude | ML 1.9 |
| Epicentral coordinates | 50.491° N, 4.965° E Uncertainty ± 2.2 km |
| Event ID | ROB 13615 |
Data source : ROB (Royal Observatory of Belgium)
Last update : 2021-06-08 10:26:35 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
- 14.6 – 92.4km
- Mean velocity, P wave
- 6.0km/s
- Mean velocity, S wave
- 3.5km/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 0.51 s. S wave: 10 measurements, root-mean-square deviation 0.45 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 | 14.6 | 143 | 11:45:11.35+2.19 s | 11:45:13.61+4.45 s | 2.26 |
| MRDMaredsous | 25.2 | 214 | 11:45:13.83+4.67 s | 11:45:17.60+8.44 s | 3.77 |
| CLAClavier | 25.3 | 108 | 11:45:13.72+4.56 s | 11:45:16.81+7.65 s | 3.09 |
| TGATangissart | 33.8 | 292 | 11:45:14.94+5.78 s | 11:45:19.74+10.58 s | 4.80 |
| DOUDourbes | 51.3 | 211 | 11:45:18.63+9.47 s | 11:45:24.50+15.34 s | 5.87 |
| RQRRonquières | 54.0 | 284 | 11:45:18.17+9.01 s | – | – |
| SKQSteenkerque | 65.1 | 286 | 11:45:19.85+10.69 s | 11:45:28.11+18.95 s | 8.26 |
| MEMSMembach | 75.3 | 80 | 11:45:22.59+13.43 s | 11:45:31.37+22.21 s | 8.78 |
| MEMHMembach | 75.3 | 80 | 11:45:22.64+13.48 s | 11:45:31.35+22.19 s | 8.71 |
| KLBKalborn | 92.4 | 118 | 11:45:25.55+16.39 s | 11:45:35.06+25.90 s | 9.51 |
| Dutch seismic network (KNMI)1 station | |||||
| HGNHeimansgroeve | 74.9 | 66 | 11:45:21.20+12.04 s | 11:45:31.28+22.12 s | 10.08 |